There are civilians in most Western armed forces around the world today and yesterday, we rely upon many non-combatant roles, aircraft engineering, e.g.) In-flight refuelling services, British Aerospace. Had a contract with them out in Oz. Had relatives in UK work for them. Aircraft advances feed from civilian - to RAF - back to civilian, it's a loop that has always existed. Take a broader perspective, the civvy - military connection has always been there.
Manchester Airport UK has an H.S. Nimrod along side one of the taxi-ways, with an air-to-air refuelling probe attached, a private firm, might be an admin role there. As I said previously, one may not find them specifically advertised in an RAF Careers Office, be creative with one's web searches, when one finds such a role put something like 'great interest in joining the RAF / Army / Navy' on ones application.
Had some great friends at RAF Kinloss in Air Traffic and ops, great bunch of guys and girls, 40-years, how time flies - unintended pun ~(B-). hi to all of them if they ever look in to see the feedback of the ATC article, now closed.
Best wishes;
NickKen.
Nick Ken