I worked for about a year at RAF Ternhill 632vgs as a volunteer, it was quite cool. I also did 4 months in the Royal Marines before I left for various reasons. I'd definitley say do all you can to become an officer, the lifestyle, pay, accomodation, food is so much better and you don't get shat on quite so much. I would imagine being an NCO in the Raf may be better than in the Army or Marines but still go for it, you might regret not trying like I did. I'm not sure how old you are but if you are of an eligible age you should join your local ATC, it is a massive advantage for selection and for adjusting to military life. If you fancy a doss join the Navy, their standards are a total joke. The selection process is stupidly easy too. I'm getting an Raf VR-T commission sometime in the next year, at the moment i'm an acting officer in the local CCF, dicking on the cadets, good times...