Questions about airforce enlistment!?

Hi! :) I have posted a few questions on here...and Im back. lol My fiance ( we will be married Oct. 18 before he enlists ) is wanting to join the airforce. Now, awhile back I posted on here asking if his mother being illegal was going to present a problem. We finally spoke to some recruiters and some said yes and 1 said no that he will do what he can for the security clearance but he wants my fiance in there December 12th to start the process (taking the ASVAB and all that) becuase that's when this school semester is over. Now, we are pretty clueless to a lot of the military terms but we are slowly learning. I have heard a lot of people talking about DEP. Is there any way for my fiance to go in December and fill out paperwork, take his ASVAB, choose his job, see the doctor and all that but not leave for boot camp until June when the next semester is over? How would he go about doing that if it is possible. All answers greatly appreciated!! :) Have a great evening!