The replys given here particularly by Tony L are spot on! The advice that most AFCOs will give, for the sake of clarity, is changing trades is not possible. This is a general statement just to ensure no ambiguity is given to a prospective candidate. That way an individual will/should be absolutely certain as to what trade they are applying for and have motivation and commitment to succeed within the trade and the RAF as a whole. However, it has been pointed out, and correctly so, that this general stance doesn't paint the whole picture. The manning issue regarding trades has been covered and this is a consideration for re-mustering. The most common situation for re-mustering is the disbandment of a particular trade, i.e. Data Analyst and Catering accountant historically and Painter & Finisher more recently. Individuals within these trades would be offered the opportunity to remuster (subject to eligibility for trade, AST/GTTB scores, education, etc) or possibly voluntray redundancy, PVR, etc. Another situation maybe where certain trade standards haven't been met, i.e ATCA. In this situation if the required assessments have not been met and the potential/suitability for further training/selection is questionable, JATCC, then an individual would be offered a remuster (usually to FOA) or PVR, etc. These examples are not exhaustive but to reiterate what Tony mentioned, you should not enter the RAF with a view of remuster. The RAF has a duty of care particularly towards personal development and this is where pursuiting aspirations can be realised. You have a right, like your civilian counterpart, to apply for NCA (Airman Aircrew) or Commissioned service (officer). Subject to educational requirements you can get access to commissioning clubs, etc designed to assist and aid research into the selection process for OASC and IOT, etc. This is NOT classed as remustering and provides an avenue for considering commission particularly after gaining experience of military life, teamworking and leadership potential. This is pertenant if a previous P2 candidate has been found NSI(R) after FI and still has an aspiration for commission/NCA...found suitable for P3 entry. I hope this answers th questions asked. Good luck with the application process and remember, I'm 'Here to help'