British Army Officer Commissioning: The Routes They Don’t Make Clear
The Army Careers Centre covers the basics. This guide covers what it tends to gloss over: the real AOSB experience, what Sandhurst is actually like, what happens to your career after commissioning, and the parts of JSP 754 that don’t appear in the glossy brochure.
1. The Three Entry Routes
University degree plus AOSB (Army Officer Selection Board). The standard path for most graduate and school-leaver officers. You attend AOSB Briefing, then AOSB Main Board before being accepted for Sandhurst.
The vast majority of officer commissions. Requires a degree (or equivalent), though some cap-badged regiments may have additional preferences. Age range typically 18–29, with some flexibility for specialist roles.
Promotion from Warrant Officer Class 1 (or sometimes WO2). Field experience replaces the degree requirement. LE Officers typically reach the rank of Major, with some reaching Lieutenant Colonel.
LE commission is a recognition of sustained exceptional performance from the enlisted ranks. It is not an automatic entitlement for WO1s — it requires a formal selection board. LE Officers typically serve in more technical, administrative, or regimental advisory roles.
For specific professional qualifications: medical officers (Army Medical Corps), legal officers (Army Legal Services), chaplains (Royal Army Chaplains' Department), and some technical specialists.
GEC officers typically hold a professional qualification (medical degree, law degree, theological training) and join at a rank reflecting their seniority. The commissioning course at RMAS is shorter than the full SMC for DE officers.
2. AOSB — What Actually Happens
The Army Officer Selection Board (AOSB), based at Westbury, Wiltshire, runs in two stages. Understanding what each stage actually assesses — not just what it tests — is the difference between candidates who prepare intelligently and those who over-prepare for the wrong things.
An initial sift. Written tests, a planning exercise and a group discussion. The Briefing gives you a Cat 1–4 result: Cat 1 (proceed to Main Board), Cat 2 (proceed after a period), Cat 3 (not yet / significant development needed), or Cat 4 (not suitable at this stage). It is not a pass/fail in the conventional sense.
The full assessment. Planning exercises, command tasks, a leaderless discussion, obstacle course, an essay (typically on current affairs), and structured interviews. The board is looking for leadership potential — not polished military knowledge, and not physical perfection. The pass rate at Main Board is broadly documented as approximately 60–70%. This means a significant minority of well-qualified candidates do not pass first time.
The written essay on current affairs is where many candidates underperform through lack of preparation. You will be expected to form a coherent argument about a complex issue. AFCO advisers often don't emphasise this sufficiently. Candidates who read quality journalism regularly — not just military-themed content — perform better.
Leadership potential, intellectual capacity, teamwork, communication under pressure, and resilience. Physical standards are a baseline, not a differentiator at this stage. Candidates who try to game the command tasks with aggressive dominant leadership tend to score poorly — assessors are experienced at recognising performance.
3. RMAS Sandhurst — The 44-Week Reality
The Royal Military Academy Sandhurst (RMAS) runs the Standard Military Course (SMC) — 44 weeks for Direct Entry officers, with commissioning in March or August each year. It is academically and physically demanding, designed to select and develop under sustained stress, not just to train.
The Junior Term (weeks 1–14) is the hardest. High physical and mental load, very little sleep, constant assessment. Many candidates who leave do so in this term. The Intermediate Term moves towards applying skills tactically in field exercises. The Senior Term focuses on leadership of junior cadets from subsequent intakes — a deliberate reverse in which you are tested by leading those less experienced than you.
Approximately 10–15% of officer cadets do not complete the SMC. This figure is documented in broad published terms. The majority of voluntary withdrawals occur in the Junior Term. Medical or injury-related withdrawals account for a proportion; voluntary withdrawals and performance-related removals account for the rest.
Sandhurst teaches leadership methodology, military doctrine, and command decision-making. It does not teach deep technical expertise — that comes in regimental training after commissioning. Many new Second Lieutenants arrive at their regiment and discover that their Platoon Sergeant has vastly more tactical and technical knowledge than they do. This is by design, but it is not always adequately explained beforehand. The adjustment can be jarring.
The Commissioning Course requires sustained physical performance across multiple fitness tests. The Army Fitness Test (AFT) — a 2-mile run in 18 minutes — applies throughout. Combat Fitness Test (CFT) loads apply to combat arms roles. Standards are applied equally across genders, with separate benchmarks published on army.mod.uk.
4. Career Trajectory Post-Commission
Commissioning is the beginning, not the achievement. The career that follows is shaped by a combination of performance, timing, regimental opportunity, and — particularly for promotion beyond Captain — competitive selection that most officers significantly underestimate when they are at Sandhurst.
The Senior Joint Appraisal Report (SJAR) governs every promotion board. It is written annually by your chain of command through the Joint Personnel Administration (JPA) system. A single poor SJAR — particularly at Major or Lieutenant Colonel board — can end a career trajectory. Most officers do not fully understand the SJAR system until it has already cost them. Read our SJAR guide.
5. Officer Pay (JSP 754 — 2024/25 Published Rates)
Published under JSP 754 (Tri-Service Regulations for Pay), the following base salary rates are the publicly available figures for 2024/25. Pay increases annually and is structured in incremental pay bands within each rank. The figures below represent the primary substantive rate for each rank.
6. What AFCO Doesn’t Always Cover
After your first posting — which you often have some choice over — subsequent postings are determined by the Army's needs, managed through the Directorate of Manning. You submit preferences, but the Army decides. An officer who joins to serve in Germany may find themselves posted to a UK garrison, then a staff job in London, with little control over either. The posting cycle is approximately every 2–3 years.
Officers sign a Return of Service commitment linked to training costs. After Sandhurst, the minimum engagement (ME) is typically 3 years (or until the end of a current tour). Officers who want to leave before this point may face financial recovery of training costs. The process is bureaucratic and sometimes slow. Many officers underestimate how difficult the exit can be when circumstances change.
RMAS teaches leadership methodology, not technical expertise. A newly commissioned officer arriving at a Royal Engineers regiment will not understand armoured engineering as well as their senior NCOs. A Signals officer will not know the kit as well as their Signallers. This is designed-in and expected — but the adjustment period can be uncomfortable, and some officers find it profoundly difficult for the first 6–12 months.
The Armed Forces Pension Scheme 2015 (AFPS15) provides an Early Departure Payment (EDP) if you leave after 20 years of service (and are aged 40 or older at exit). Before that point, you have a preserved pension payable at Normal Pension Age (60). The old AFPS05 scheme for those who joined before April 2015 is substantially more generous at certain exit points. If you were transferred to AFPS15 under the 2015 reforms, understanding the difference matters significantly.
The British Army contains regiments and corps with vastly different cultures. An officer's experience in the Parachute Regiment, the Royal Signals, the Royal Logistics Corps, or the Household Division will be very different day-to-day experiences, even at the same rank. AFCO presentations tend to present a uniform picture. Visiting regiments during the selection process — which AFCO encourages — is one of the few reliable ways to assess this.