RAF Officer & Aircrew Selection (OASC) Explained

If you want to become an officer or aircrew in the Royal Air Force, at some point your application will lead you to the Officer and Aircrew Selection Centre (OASC) at RAF College Cranwell in Lincolnshire. OASC is where the RAF takes a proper, in-person look at whether you have the qualities to lead, to fly, or to operate at the sharp end of an air force. It is a demanding stage, but it is far less mysterious once you understand what each part is actually testing. The RAF reviews and updates its process regularly, so always confirm the current details on the official recruitment site at recruitment.raf.mod.uk before you apply.

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What OASC is and who goes

OASC is the single centre through which the RAF selects its future officers and non-commissioned aircrew. If you are applying for a commission — whether as a pilot, an engineer officer, an operations officer, an RAF Regiment officer or any other branch — your route runs through OASC. The same is true if you are aiming for a flying or aircrew role such as weapon systems officer or weapon systems operator. The centre exists to test the qualities that matter in these jobs: leadership, sound judgement, the ability to think clearly under pressure, effective communication, and genuine motivation for the role and the Service.

Rather than a single test, OASC is best thought of as a rounded assessment. It combines aptitude testing, an interview, group and planning exercises, a fitness test and a medical, and it looks at how you perform across all of them. Nobody is expected to be perfect at everything, but the board wants to see well-rounded potential.

How OASC relates to the DAA

The Defence Aptitude Assessment (DAA) is an early hurdle in the RAF application, and it sits before or alongside the wider selection journey rather than at OASC itself. It is a timed, multiple-choice test covering areas such as verbal and numerical reasoning, work rate, spatial reasoning, and mechanical and electrical comprehension. Your results help determine which roles you qualify to be considered for, so a strong performance keeps the widest range of options open. For the full breakdown, see our Defence Aptitude Assessment explained guide.

If you are chasing a flying or aircrew role, be aware that the DAA is only the first layer of aptitude testing. Aircrew candidates complete further specialised, computer-based aptitude assessments built around the real demands of controlling an aircraft — think hand–eye coordination, multi-tasking and rapid decision-making. Our guide on RAF pilot aptitude covers this in more detail. The important point is that the DAA opens the door; OASC is where the fuller picture comes together.

Inside OASC: the main elements

Aptitude tests

At OASC, and depending on your chosen branch or role, you may sit computer-based aptitude tests designed to gauge your potential to develop the skills the RAF values. Because these are largely measuring underlying ability, you cannot cram for them — but arriving well rested, calm and familiar with the general question styles helps you perform at your best. The reasoning habits you build preparing for the DAA carry through here.

The interview

Expect a structured, individual interview that explores your knowledge of the RAF and your chosen role, your understanding of the training and career that follow, and — crucially — your motivation for joining. To prepare, research your branch thoroughly, understand what the day-to-day job involves, and be ready to explain honestly why you want it. A working awareness of current affairs and defence-related news also helps, as does being able to talk confidently about your own experiences of leadership, teamwork and dealing with setbacks.

Group and planning exercises

OASC assesses how you work with others through group discussions and problem-solving tasks, alongside a planning exercise that you typically tackle first on your own and then as a team. Practical, hands-on leadership and teamwork tasks are also part of the mix. The assessors are not looking for the loudest person in the room; they want to see clear thinking, good communication, the ability to contribute and to listen, and calm decision-making when a problem is ambiguous or time is short. Stay composed, involve others, and focus on solving the task rather than winning the argument.

Fitness test

A fitness assessment is part of selection, giving an objective marker of your physical condition and the training you have put in. The most reliable preparation is simple: build a consistent running and general-fitness routine well in advance so that you arrive comfortably able to meet the required standard rather than scraping through. Our fitness test guidance gives a general sense of what forces fitness testing involves, though standards differ between Services and roles.

Medical

A medical examination confirms that you meet the health standards the RAF requires, which are high — some conditions that are minor in civilian life can still affect eligibility. This is usually arranged through your careers office as part of the wider process. There is little to "prepare" here beyond being honest and having your medical history to hand.

How to prepare — in general terms

• Know your motivation. Be able to explain clearly and honestly why you want your chosen role and the RAF.
• Stay current. Follow the news and have a basic awareness of defence and current affairs for the interview.
• Stay calm in group tasks. Contribute, listen, and keep thinking clearly under time pressure.
• Get fit early. Build a training routine so the fitness test is comfortable, not a scramble.
• Sharpen your reasoning. Work through a full set of DAA practice tests to build speed and confidence that carries into selection.

Above all, remember that specifics — test durations, fitness standards, pass marks and medical criteria — change over time and vary by role. We deliberately avoid quoting exact figures, and you should treat any source claiming to know precise cut-scores with caution. Always check the current, official details on recruitment.raf.mod.uk.

For the full journey from application to attestation, see our overview of how to join the RAF, and read what happens after the DAA to understand where OASC sits in the wider timeline.