Field entry, published 2026-11-03T00:00:00.000Z, updated 2026-11-03T00:00:00.000Z. Group: Major Group 0: Armed forces occupations

What work sits in Major Group 0?

Major Group 0 holds occupations whose work is service in the armed forces, organised through rank, command and a military chain of responsibility. A job sits in this group when its defining character is membership of an armed force and performance of military duties under that structure, rather than civilian employment that happens to support defence from outside. The uniform, the rank and the command relationship are therefore central to the classification, not incidental details around a civilian occupation.

Which broad families appear inside the group?

The ILO structure below Major Group 0 contains three sub-major families, three minor groups and three unit groups in total. That compact shape already tells a reader something useful. The group does not sort armed forces work by weapon, vehicle, branch or technical specialty in the way other major groups sort by field of knowledge. It sorts mainly by position in the rank hierarchy. The three families are commissioned officers, non-commissioned officers and other ranks, and each family forms its own branch of the ladder beneath the major group.

Broad family	What defines it in classification terms
Commissioned officers	Command, planning and direction at officer level
Non-commissioned officers	Supervision and skilled execution between officers and other ranks
Other ranks	Ranked service carrying out assigned military duties

That table is a map, not a roster of every military job. Within each family, the detailed ILO hierarchy gives the narrower grouping, and readers who need a precise grouping should consult the official ILO structure rather than inferring it from a rank title used in one country.

Why does rank matter more than specialty here?

In civilian classification, a doctor, an engineer and a clerk are separated largely by field of knowledge and by the tools and tasks of the occupation. Armed forces work cuts across those fields. A military unit may contain people doing medical, engineering, communications, logistics and combat tasks, yet the ILO places them together when their occupation is defined by armed service itself. The shared element is not a single civilian skill. It is service under military discipline, in a ranked organisation, where orders, readiness and operational duty shape the work.

This approach keeps national statistics comparable even though countries organise their forces differently. Rank structures differ in titles, in the number of grades and in the exact duties attached to each grade. A classification built on national rank names would break down at the first border. A classification built on broad position, on whether the role commands, supervises or serves as another rank, travels more cleanly across countries. It still leaves room for national detail below the international level, but the international sorting stays recognisable.

What work stays outside Major Group 0?

Civilian work in a defence ministry, a defence factory or a military hospital does not automatically enter this group. A civilian administrator who processes defence contracts, a civilian engineer who designs equipment and a civilian nurse who treats patients in a civilian post are classified by the occupation they perform, in the civilian major group that fits that occupation. Membership of the armed forces is the dividing line, not proximity to military activity.

The same logic applies to reservists and to people who move between civilian and military roles. Classification follows the job being classified, in the period and post that the statistical record describes. A person can therefore be associated with different occupations at different times, and a single person may hold a civilian occupation in one job and an armed forces occupation in another. The group describes jobs, not whole identities, and it does not claim that a person belongs to only one kind of work for life.

How should a reader use this group?

Treat Major Group 0 as the first sorting step for armed forces occupations. It answers the broad question of whether the work is military service under rank and command. It does not answer which detailed unit group fits a particular post, and it does not settle questions about eligibility, promotion, pay or legal status in any national force. Those questions belong to national military authorities and to employment records, not to an international statistical classification.

Readers who work with survey data should also remember the small size of the group. With only three unit groups at the most detailed level, Major Group 0 gives a coarse picture by design. It can show the broad split between officers, non-commissioned officers and other ranks, but it cannot show the full variety of specialties inside a modern force. That coarseness is a deliberate trade. It preserves comparability across countries at the cost of fine detail, and finer detail must come from national classifications or from service records rather than from ISCO-08 alone.

In short, Major Group 0 gathers ranked military service into one place, sorted by position in the hierarchy, and it leaves civilian defence work to the civilian groups where that work belongs.

Sources checked

1. International Labour Organization, ISCO-08 structure

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