Why is it 21 Supply Company, not 21st Supply Company

This article began with a deceptively simple question: Should the unit be written as 21 Supply Company or 21st Supply Company?

Many soldiers instinctively know how unit titles are written, but few people ever stop to ask why the numbering systems look the way they do.

At first glance, the difference might appear trivial, perhaps no more than a matter of grammar or stylistic preference. However, the answer lies in the historical conventions for naming units in the New Zealand Army.

Throughout New Zealand military history, some formations have been designated using ordinal numbering, such as 1st Battalion, 2nd Battalion, or 20th Battalion. Others, however, use numerical identifiers, such as 10 Transport Company, 21 Supply Company, or 38 Combat Service Support Company. To someone unfamiliar with the historical background, the difference can appear inconsistent or even arbitrary.

In fact, it reflects several overlapping numbering systems inherited from British military practice and adapted over time within the New Zealand Army. Understanding these systems explains why some units are correctly written using ordinal titles while others are not. In the case that prompted this article, the historically correct form is 21 Supply Company, not 21st Supply Company, because the number functions as a unit identifier rather than an ordinal designation.

The difference ultimately comes down to a simple question: is the number describing a unit’s place in a sequence, or is it simply part of the unit’s title?

Before going further, one caveat is important. The units discussed below are examples only, chosen to illustrate the different naming conventions used within the New Zealand Army. They are not intended to provide a complete list of unit, battalion, company, brigade, or corps designations. The New Zealand Army has existed in various forms for more than 180 years, and cataloguing every unit raised during that time would be far beyond the scope of a short article. Instead, the examples that follow are intended to demonstrate the logic behind the naming systems rather than to present a comprehensive order of battle.

To understand why these different conventions exist, it is necessary to look briefly at how unit naming developed. The story begins with British military practice, passes through the organisational reforms that shaped New Zealand’s Territorial Force, and continues through the numbering systems used in the world wars and the modern Army. Seen together, these developments explain why some units carry ordinal titles while others use numbers simply as identifiers.

British origins of the problem

To understand why New Zealand Army units sometimes use ordinal numbers and sometimes use simple numerical identifiers, it is necessary to look first at the traditions inherited from the British Army. The naming conventions that shaped the organisation of New Zealand’s military forces were not created locally in isolation. They evolved from long-established British military practices that were adopted and adapted as New Zealand’s own forces developed.

The British regimental system developed over centuries. Early regiments were originally raised by individual colonels and were often known informally by the name of their commanding officer. Over time, however, the British Army introduced a formal numbering system based on seniority, producing titles such as the 1st Regiment of Foot, 23rd Regiment of Foot, and 42nd Regiment of Foot.[1]

Within those regiments, battalions were then numbered sequentially as 1st Battalion, 2nd Battalion, and so on. This established the long-standing tradition of ordinal numbering for combat units, particularly infantry.[2]

At the same time, specialist corps such as the Royal Army Service Corps, Royal Engineers, and Royal Army Ordnance Corps often used numbers in a different way. In those organisations, a number frequently acted simply as a unit identifier, not as a position within a sequence. In other words, the number formed part of the unit’s title rather than describing it as the first, second, or twenty-first of its kind.

That distinction between ordinal numbering and numerical identification was inherited by Commonwealth armies, including New Zealand, and it lies at the heart of the question that prompted this article: why a unit such as 21 Supply Company is correctly written without the ordinal form.

The three numbering systems

In practice, New Zealand military history shows three overlapping numbering systems.

• The first is ordinal numbering, where a number indicates sequence within a regiment, brigade, or series. A 1st Battalion is the first battalion in that sequence, a 2nd Battalion the second, and so on.
• The second is the numerical identifier, where the number is simply part of the unit’s formal title. In this system, 21 Supply Company is not the “twenty-first supply company” in a grammatical sense, but rather unit number 21.
• The third is administrative or organisational numbering, where numbers are assigned as part of a wider formation, district, corps, or planning system. These can sometimes look arbitrary unless one knows the structure that produced them.

These systems rarely existed in isolation. New Zealand Army unit titles often bear the imprint of more than one numbering tradition simultaneously. A number that originally served as an administrative or regional identifier could later acquire a regimental meaning once units were reorganised into new formations. As a result, the same designation may simultaneously reflect earlier command structures, later regimental sequencing, and practical shorthand used in everyday military communication. Understanding this layering is essential when interpreting unit titles in New Zealand military history.

The transition from the Volunteer era to the Territorial Force

The numbering conventions seen in the New Zealand Army did not appear suddenly. They developed gradually as the country’s military system evolved from a loose network of volunteer corps into a nationally organised force.

During the nineteenth-century Volunteer era, most units were identified primarily by local or regional titles rather than by numbers. Rifle companies and mounted units were usually named after the towns, districts, or communities that raised them. Titles such as the Christchurch City Guards, Wanganui Guards, Napier Guards, or Heretaunga Mounted Rifles reflected the civic origins of these formations rather than any national organisational system. Volunteer units, therefore, tended to carry descriptive names tied to locality or social identity rather than numerical designations.

By the turn of the twentieth century, however, the limitations of the volunteer system were becoming clear. The experience of the South African War exposed weaknesses in mobilisation and organisation, prompting a series of reforms to create larger, more coherent formations.

One result was the reorganisation of volunteer units into regiments composed of multiple local squadrons or companies. For example, mounted volunteer units in the Auckland region were grouped into formations such as the 1st, 2nd, 3rd, and 4th Regiments of Auckland Mounted Rifle Volunteers, each drawing together previously independent local squadrons from surrounding districts.

Infantry volunteers underwent a similar consolidation. Local rifle companies were organised into battalions such as the 1st Battalion Auckland Infantry Volunteers (Countess of Ranfurly’s Own) and the 2nd Battalion Auckland (Hauraki) Infantry Volunteers, which brought together companies raised across a wider geographic region.

These reforms marked an important transition. Local identities remained important at company or squadron level, but the regiment or battalion increasingly became the principal administrative unit, and numbering began to appear more regularly in formation titles.

The Defence Act 1911 and the creation of the modern New Zealand Army

The final stage in the evolution of New Zealand’s early military forces occurred with the Defence Act 1911. This legislation abolished the Volunteer Force and replaced it with the New Zealand Territorial Force. This nationally organised military system marked the effective establishment of the modern New Zealand Army.

Under the new structure, New Zealand was divided into four military districts, each responsible for raising and maintaining a defined set of units across the principal arms of service. These reforms did more than reorganise the force administratively. They also introduced several distinct naming conventions that combined national numbering, regional identity, and functional designations. Many of these conventions continued to influence New Zealand Army unit titles throughout the twentieth century and remain visible in modern formations today.

Infantry and Mounted Rifles: numbered regiments with regional titles

For the principal combat arms of the Territorial Force, particularly the infantry and mounted rifles, the new system adopted national regimental numbering while retaining strong regional identities. Volunteer battalions and mounted rifle corps were reorganised into regiments that carried both a number and a geographical designation.

The 1911 reforms also introduced several different naming conventions across the various arms of service. The examples below are not intended to catalogue every Territorial unit. Rather, they illustrate how different branches of the Territorial Force adopted distinct naming systems simultaneously:

Mounted Rifles Regiments

• 1st Mounted Rifles (Canterbury Yeomanry Cavalry) – Christchurch
• 2nd (Wellington West Coast) Mounted Rifles – Wanganui
• 3rd (Auckland) Mounted Rifles – Auckland
• 4th (Waikato) Mounted Rifles – Hamilton
• 5th Mounted Rifles (Otago Hussars) – Dunedin
• 6th (Manawatu) Mounted Rifles – Palmerston North
• 7th (Southland) Mounted Rifles – Invercargill
• 8th (South Canterbury) Mounted Rifles – Timaru
• 9th (Wellington East Coast) Mounted Rifles – Napier
• 10th (Nelson) Mounted Rifles – Blenheim
• 11th (North Auckland) Mounted Rifles – Kawakawa
• 12th (Otago) Mounted Rifles – Balclutha

The infantry regiments were organised in a similar fashion.

Infantry Regiments

• 1st (Canterbury) Regiment – Christchurch
• 2nd (South Canterbury) Regiment – Timaru
• 3rd (Auckland) Regiment (Countess of Ranfurly’s Own) – Auckland
• 4th Regiment (Otago Rifles) – Dunedin
• 5th Regiment (Wellington Rifles) – Wellington
• 6th (Hauraki) Regiment – Paeroa
• 7th (Wellington West Coast Rifles) – Wanganui
• 8th Regiment (Southland Rifles) – Invercargill
• 9th Regiment (Wellington East Coast Rifles) – Napier
• 10th Regiment (North Otago Rifles) – Oamaru
• 11th Regiment (Taranaki Rifles) – Stratford
• 12th (Nelson) Regiment – Nelson
• 13th (North Canterbury) Regiment – Rangiora
• 14th Regiment (South Otago Rifles) – Milton
• 15th (North Auckland) Regiment – Whangārei
• 16th (Waikato) Regiment – Hamilton

These titles demonstrate a dual convention. The numerical component formed part of a national regimental sequence, while the regional designation preserved the historic recruiting and community links inherited from the Volunteer era.

Artillery: lettered batteries within brigades

Artillery units followed a different naming convention from the infantry and mounted rifles. Rather than numbered regiments, the New Zealand Field Artillery was organised into field artillery brigades composed of lettered batteries. This reflected long-standing British artillery practice, where batteries traditionally carried letter designations rather than numerical titles.

Following the Defence Act 1911 reforms, the Territorial artillery was organised into several regional field artillery brigades located in the principal military centres. These brigades contained batteries such as:

Auckland Field Artillery Brigade

• A Battery – Auckland
• B Battery – Auckland
• K Battery – Hamilton

Canterbury Field Artillery Brigade

• E Battery – Christchurch
• H Battery – Christchurch

Otago Field Artillery Brigade

• B Battery – Dunedin
• C Battery – Dunedin
• J Battery – Invercargill

Wellington Field Artillery Brigade

• D Battery – Wellington
• F Battery – Wellington

This artillery system illustrates another variation in New Zealand’s early military naming conventions. Unlike infantry and mounted rifle regiments, which combined numbers with regional titles, artillery units were identified primarily by lettered batteries grouped within brigades associated with particular districts.

Garrison Artillery: numbered companies

Coastal defence units of the New Zealand Garrison Artillery used another naming convention again. Rather than regiments or lettered batteries, garrison artillery formations were organised as numbered companies assigned to port defence roles.

Examples included:

• No. 1 Company, New Zealand Garrison Artillery – Auckland
• No. 2 Company, New Zealand Garrison Artillery – Auckland
• No. 3 Company, New Zealand Garrison Artillery – Wellington
• No. 4 Company, New Zealand Garrison Artillery – Lyttelton
• No. 5 Company, New Zealand Garrison Artillery – Wellington
• No. 6 Company, New Zealand Garrison Artillery – Dunedin / Port Chalmers
• No. 7 Company, New Zealand Garrison Artillery – Dunedin / Port Chalmers
• No. 8 Company, New Zealand Garrison Artillery – Dunedin / Port Chalmers

In this case the numbers functioned as administrative identifiers, rather than ordinal titles within a regiment.

Signals: geographically named companies

Signals units followed a different naming convention again. Rather than using national numbering, signal formations in the Territorial Force were generally designated by geographical titles reflecting the formations they supported.

Examples included:

• Auckland Mounted Signal Troop (later often described as a company) – Auckland
• Wellington Mounted Signal Troop – Wellington
• Canterbury Mounted Signal Troop – Christchurch
• Otago Mounted Signal Troop – Dunedin

These titles reflected the regional mounted formations to which they were attached. Unlike infantry regiments or garrison artillery companies, signal units were not organised into a national numerical sequence. Their naming therefore illustrates another variation within the wider system of Territorial Force designations established after the Defence Act 1911.

Medical units: numbered field ambulances

Medical units followed another distinct naming convention within the Territorial Force established by the Defence Act 1911. Rather than regiments or geographically titled units, the New Zealand Medical Corps organised its operational medical formations as numbered field ambulances. These units provided front-line medical support to both infantry and mounted formations of the Territorial Force.

The infantry formations were supported by four field ambulances located in the principal military centres:

Infantry Field Ambulances

• No. 1 Field Ambulance – Auckland
• No. 2 Field Ambulance – Wellington
• No. 3 Field Ambulance – Christchurch
• No. 4 Field Ambulance – Dunedin

Mounted formations were supported by four mounted field ambulances, reflecting the importance of mounted rifle brigades within the pre-war defence system:

Mounted Field Ambulances

• No. 5 Mounted Field Ambulance – Hamilton
• No. 6 Mounted Field Ambulance – Christchurch
• No. 7 Mounted Field Ambulance – Invercargill
• No. 8 Mounted Field Ambulance – Palmerston North

In this system the numbers functioned primarily as organisational identifiers within the medical service, rather than as ordinal titles within a regimental structure. The designations therefore reflected the administrative structure of the New Zealand Medical Corps rather than the sequence of units within a regiment.

Supply and transport services

At the time of the 1911 reorganisation, the supply and transport functions of the Territorial Force had not yet developed into the clearly defined corps structure that later characterised the New Zealand Army Service Corps. Logistic support remained largely organised through district administrative arrangements and small service elements attached to formations.

The more recognisable structure of transport and supply units associated with the New Zealand Army Service Corps emerged later, particularly during the mobilisation and expansion of the New Zealand Expeditionary Force in the First World War. As a result, the 1911 Territorial Force organisation does not yet display the numbered transport and supply units that would later become familiar within the New Zealand Army’s logistic system.

Multiple naming traditions

The Territorial Force created by the Defence Act 1911, therefore, established several different naming conventions simultaneously:

Arm	Naming convention
Infantry	Numbered regiments with regional titles
Mounted Rifles	Numbered regiments with regional titles
Artillery	Lettered batteries within brigades
Garrison Artillery	Numbered companies
Signals	Geographic titles
Medical units	Numbered field ambulances

This mixture of systems reflected both British military practice and New Zealand’s regional recruiting structure. The result was a force in which regimental numbering, administrative identifiers, lettered batteries, and geographic titles all existed side by side.

The regimental foundation of wartime battalion numbering

An important consequence of the Defence Act 1911 reforms was that the Territorial Force was organised primarily around regiments rather than battalions. Each infantry regiment existed as a regional administrative formation composed of companies drawn from its district. The regiment therefore served as the permanent organisational framework of the Territorial Force.

When New Zealand raised the New Zealand Expeditionary Force in 1914, the Army did not abandon this structure. Instead, the new expeditionary infantry units were formed by raising battalions within the existing Territorial regiments.

This explains why the battalions of the New Zealand Division were numbered within their parent regiments rather than across the army as a whole. The Auckland Regiment had a 1st Battalion and later a 2nd Battalion, the Wellington Regiment had its own 1st and 2nd Battalions, and the same pattern applied to the Canterbury and Otago Regiments.

The numbering therefore reflected regimental sequence rather than national sequence. What appears at first glance to be a simple numbering system was in fact the direct consequence of the Territorial regimental structure created by the Defence Act 1911.

By the time New Zealand entered the First World War in 1914, the foundations of the Army’s naming traditions had therefore already been laid. The coexistence of regimental numbering, administrative identifiers, lettered batteries, and geographically named units explains why several different numbering conventions appear throughout New Zealand military history.

Understanding the structure introduced in 1911 is therefore essential for interpreting later developments, from the battalion numbering of the New Zealand Expeditionary Forces to the numerical identifiers still used by many support units in the modern New Zealand Army. The purpose here is not to trace every organisational change in the New Zealand Army, but to highlight the moments where numbering systems influenced how units were titled

World War I and the regimental system

In the First World War, New Zealand’s infantry battalions were organised primarily around the country’s territorial regiments. By 1916, the New Zealand Division contained three infantry brigades and twelve infantry battalions, plus the New Zealand Pioneer Battalion as a battalion-sized support formation. The division’s order of battle included the 1st Infantry Brigade with the 1st Battalions of the Auckland, Wellington, Canterbury, and Otago Regiments, the 2nd Infantry Brigade with the corresponding 2nd Battalions, and the Rifle Brigade with its 1st, 2nd, 3rd, and 4th Battalions.[3]

So, in simple terms, the divisional structure looked like this:

• 1st Infantry Brigade – 4 battalions
• 2nd Infantry Brigade – 4 battalions
• New Zealand Rifle Brigade – 4 battalions
• New Zealand Pioneer Battalion – support unit

This is a good example of ordinal numbering. The numbers were internal to each regiment or brigade structure. Thus, Auckland had a 1st Battalion and a 2nd Battalion, Wellington had a 1st Battalion and a 2nd Battalion, and so on. The number described a battalion’s place within its parent regimental structure, not within a single national sequence.

The inter-war shift: Territorial regiments numbered 1 to 17

The Territorial Force infantry regiments were reorganised and numbered nationally. By the late interwar period, New Zealand’s Territorial infantry regiments numbered 1 to 17, with the 17th (Ruahine) Regiment being the highest-numbered.[4] These matters are explained because it explains one of the most common Second World War numbering questions: why the 2nd New Zealand Expeditionary Force (2NZEF) battalions began at 18.

When New Zealand raised the 2NZEF in 1939, it did not reuse the First World War provincial-battalion naming system. Instead, it continued the existing national numbering sequence used in the Territorial Force. That is why the first expeditionary battalions became the 18th, 19th, and 20th Battalions, rather than restarting at 1.

The Second World War and the 2nd New Zealand Division

The 2nd New Zealand Division, formed from 2NZEF under Major-General Bernard Freyberg, followed this national numerical sequence. Its main infantry battalions included the 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, and 26th Battalions, along with the 27th Battalion as the divisional machine-gun battalion and the 28th (Māori) Battalion.

Structurally, the division expanded as follows:

• 4th Infantry Brigade – 18th, 19th, 20th Battalions
• 5th Infantry Brigade – 21st, 22nd, 23rd Battalions
• 6th Infantry Brigade – 24th, 25th, 26th Battalions
• plus 27th Battalion and 28th (Māori) Battalion in specialist or attached roles.

This was still ordinal numbering, but it operated within a single national battalion sequence, rather than within provincial regiments as in the First World War. In that sense, the Second World War system was both simpler and more centralised.[5]

The 3rd New Zealand Division and the continuation of the sequence

The 3rd New Zealand Division, formed for operations in the Pacific under Major-General Harold Barrowclough, broadly carried forward the same practice. Its infantry battalions were numbered in the next available block after the 2NZEF battalions, rather than restarting at 1. Its brigades included battalions such as the 29th, 30th, 34th, 35th, 36th, and 37th Battalions, which served in the Solomon Islands campaign, including operations at Vella Lavella, the Treasury Islands, and the Green Islands.[6]

A simplified picture looks like this:

• 8 Infantry Brigade – 29th, 30th, 34th Battalions
• 14 Infantry Brigade – 35th, 36th, 37th Battalions

The sequence appears irregular because some numbers were allocated to home defence, training, or planned battalions that were never fully fielded overseas. But the principle remained the same: the New Zealand Army used a continuous national numbering sequence for infantry battalions, rather than a separate sequence within each division.

This is worth stressing because it reveals a distinctive New Zealand habit. Unlike larger armies, which often maintained several simultaneous regimental numbering systems, the New Zealand Army frequently preferred a single national sequence that applied across formations.

The RNZIR and the creation of 2/1 RNZIR

In 1964, the infantry arm was reorganised into the Royal New Zealand Infantry Regiment (RNZIR). For much of the Cold War, New Zealand maintained one regular battalion, 1 RNZIR, based in Singapore with a depot in Burnham, while the regiment also contained Territorial Force battalions based on New Zealand’s historic regional infantry regiments:[7]

• 2 RNZIR – Canterbury, Nelson-Marlborough and West Coast
• 3 RNZIR – Auckland (Countess of Ranfurly’s Own) and Northland
• 4 RNZIR – Otago and Southland
• 5 RNZIR – Wellington West Coast and Taranaki
• 6 RNZIR – Hauraki
• 7 RNZIR – Wellington (City of Wellington’s Own) and Hawke’s Bay

When 1 RNZIR’s Burnham depot was expanded in 1973 to create a second regular battalion, the Army faced a numbering problem. It could not simply call the new unit 2 RNZIR, because that title was already in use by a Territorial battalion. The solution was to designate the new unit 2/1st Battalion, Royal New Zealand Infantry Regiment, or 2/1 RNZIR. This meant, in effect, the second battalion of the 1st Regiment.[8]

That may look unusual at first glance, but it follows a well-established British precedent from the First World War, in which Territorial battalions were duplicated as lines such as 1/6th and 2/6th Battalions. It is therefore another example of ordinal logic, but in a slightly more complex regimental form. [9]

Numerical identifiers in support and logistics units

By contrast, many support units use numbers as identifiers rather than ordinals. Examples include:

• 10 Transport Company
• 21 Supply Company
• 5 Movements Company
• 3 Workshop Company
• 38 Combat Service Support Company

In these cases, the number forms part of the unit’s title. 21 Supply Company does not mean the twenty-first supply company raised in some sequence. It means unit number 21. That distinction is important because it explains why the correct historical form is 21 Supply Company, not 21st Supply Company.

A useful historical example of this administrative numbering can be seen in the redesignation of 7 Petroleum Platoon.

Within the Royal New Zealand Army Service Corps (RNZASC), petroleum supply and distribution formed part of the corps’ wider responsibility for transport and logistic support. Unlike transport units, however, the petroleum function was concentrated in a single specialised unit, 7 Petroleum Platoon (7 Pet Pl), which provided the Army’s bulk fuel storage, handling, and distribution capability.

When the New Zealand Army reorganised its logistic corps, the functions of the RNZASC were divided between two successor organisations. Transport, movement, and catering functions were transferred to the Royal New Zealand Corps of Transport (RNZCT), while supply responsibilities, including petroleum storage and fuel distribution, were transferred to the Royal New Zealand Army Ordnance Corps (RNZAOC).

As part of this restructuring, 7 Pet Pl moved from the RNZASC to the RNZAOC. Rather than simply retaining its existing title, the unit was redesignated 47 Petroleum Platoon (47 Pet Pl).

The new designation reflected the RNZAOC organisational structure. The 4 represented the platoon’s new parent formation, 4 Supply Company, while the 7 preserved the unit’s earlier identity as 7 Pet Pl.

The resulting title, therefore, linked the unit’s historical lineage with its new organisational placement. The number was not an ordinal title but an administrative identifier reflecting both structure and heritage.

A 1963 Logistic Support Group diagram reinforces this logic. In that structure, the unit appears as HQ 21 Sup Coy within the CRASC (Commander Royal Army Service Corps) grouping, alongside other numerically designated logistics elements such as transport, petroleum, and supply units. That reflects the older British-derived service corps system, in which many logistics units were titled by identifier rather than ordinal sequence.

Regional command numbering in the New Zealand Army

Another layer utilised was one in which units were allotted numbers aligned with regional command structures. In broad terms:

• 1 related to the Northern Military District
• 2 to the Central Military District
• 3 to the Southern Military District
• 4 to Army Training Group, Waiouru
• 5 to Force Troops (units that are held at formation or army level rather than permanently assigned to a specific brigade or battalion, and which can therefore be allocated where needed to support operations across the wider force.)

This convention was never applied universally, and many units, especially those with strong historical lineage, retained their historic titles, i.e., 10 Transport Squadron.[10] But it added another layer to the numbering picture.

A modern case study: 38 Combat Service Support Company

A particularly revealing modern example is 38 Combat Service Support Company (38 CSS Coy). The number 38 was not chosen as an ordinal, and it does not mean the thirty-eighth company in sequence. Instead, it was deliberately constructed by adding together the identifiers of the core Regular Force logistics units in 2 Combat Service Support Battalion:

• 21 Supply Company = 21
• 2 Workshop Company = 2
• 5 Movements Company = 5
• 10 Transport Company = 10

That gives 21 + 2 + 5 + 10 = 38.

So, 38 CSS Coy is a unit identifier created from the combined logic of the battalion’s component units. Accordingly, the historically correct form is 38 CSS Coy, not 38th Combat Service Support Company.

Regional Origins and Regimental Sequencing

In the contemporary New Zealand Army, some unit titles reflect the interaction between earlier regional numbering systems and later regimental structures. A useful example can be seen in the logistics battalions of the Royal New Zealand Army Logistic Regiment (RNZALR):

• 2nd Combat Service Support Battalion (2 CSSB) at Linton
• 3rd Combat Service Support Battalion (3 CSSB) at Burnham

The numerical prefixes in these unit titles originate in the earlier regional command system of the New Zealand Army. Under that structure, the number 2 was associated with the Central Military District, where Linton was located, while the number 3 was associated with the Southern Military District, which included Burnham.

When the RNZALR was later formed and its logistics battalions established, these numbers were retained. As a result, the designations now perform a dual function. Historically, they reflect the regional command system from which the units emerged. Within the regimental structure, however, they also align naturally with the concept of the 2nd and 3rd battalions of the RNZALR.

For this reason, both forms are encountered in practice. The abbreviated forms 2 CSSB and 3 CSSB are widely used in operational writing and everyday speech, while the full titles 2nd Combat Service Support Battalion and 3rd Combat Service Support Battalion reflect their place within the regimental structure.

This example illustrates how New Zealand Army unit titles often carry layers of historical meaning, with administrative, regional, and regimental traditions overlapping within a single designation.

The key question

When faced with a numbered unit, the most useful question is very simple: Does the number describe a sequence or an identity?

If it describes a sequence, then the ordinal form is appropriate.

If it identifies the unit itself, then the number normally stands alone.

That single distinction explains a great deal.

Why this matters

At first glance, this may appear to be a minor grammatical detail. In reality, it is something more significant. Unit titles form part of the historical identity and lineage of military organisations. They reflect how armies were structured, how formations evolved, and how traditions were carried forward over time. Using the correct form therefore preserves historical accuracy, reflects the organisational logic of the period, and maintains continuity with a unit’s heritage.

Examples such as 1st Battalion, 2/1 RNZIR, 21 Supply Company, and 38 CSS Coy illustrate this clearly. They do not belong to a single, tidy numbering system. Instead, they represent several overlapping traditions, regimental, national, administrative, and functional, that have developed across more than a century of New Zealand military history.

Understanding those traditions reveals that what might appear to be inconsistent naming is the result of historical continuity. Different arms of service, different organisational systems, and different periods of reform have each left their mark on how units are titled.

Seen in that context, the answer to the question that prompted this article becomes clear. 21 Supply Company is not the twenty-first supply company in a sequence. It is unit number 21. The number forms part of the unit’s designation rather than an ordinal description of its place in a series.

Once that distinction is understood, the logic behind the New Zealand Army’s naming conventions becomes much easier to recognise. What might initially appear to be a small grammatical point is, in fact, a window into the organisational history of the Army itself. In that sense, even a simple unit title can serve as a small but revealing trace of the Army’s institutional memory.

And that is why the correct form is 21 Supply Company, not 21st Supply Company.

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Notes

[1] E.M. Spiers, The Army and Society, 1815-1914 (Longman, 1980).

[2] R. Holmes, Redcoat: The British Soldier in the Age of Horse and Musket (HarperCollins Publishers, 2011).

[3] Glyn Harper, Johnny Enzed: the New Zealand soldier in the First World War 1914-1918 (Exisle Publishing Limited, 2015).

[4] D. A. Corbett, The regimental badges of New Zealand: an illustrated history of the badges and insignia worn by the New Zealand Army (Auckland, NZ: Ray Richards, 1980 Revised enl. edition, 1980), Non-fiction.

[5] C. Pugsley, A Bloody Road Home: World War Two and New Zealand’s Heroic Second Division (Penguin Books, 2014).

[6] O.A. Gillespie, The Pacific (War History Branch, Department of Internal Affairs, 1952).

[7] Corbett, The regimental badges of New Zealand: an illustrated history of the badges and insignia worn by the New Zealand Army.

[8] P. Koorey, Still Second to None: The Second 25 Years : 2nd/1st Battalion Royal New Zealand Infantry Regiment : 1999-2024 : Operational Tours and Peacekeeping Missions in the South-West Pacific and Further Afield (John Douglas Publishing, 2024).

[9] I.F.W. Beckett, Territorials: A Century of Service (DRA Pub., 2008).

[10] Grant John Morris, Wagons of war : a history of 10 Transport Company 1951-2011 (Manawatu, New Zealand: Massey University, 2012). https://mro.massey.ac.nz/bitstream/handle/10179/3840/02_whole.pdf?sequence=1&isAllowed=y.