The other Q is why he wants to join. If he wants to be an air traffic controller then he should try and pursue the job through other means; a civilian air traffic controller does so much actual controlling. Many mil units spend hours these days sitting around talking to very few ac (and glued to a PC doing associated duties). Plus he will be asked to do so much more than his primary role; in fact the sad thing is alot of mil air traffic controllers see the actual primary role as a necessary annoyance in which to progress up the ladder. Sad times.