If you can finish one story, go for it, if you can finish both, I will be incredibly surprised. If you can finish one that is an accomplishment, but what I do for my story now is carry a notebook at all times because you never know when inspiration will strike. I've been on the bus before and I'll just zip open my backpack, take out my notebook, and start scribbling like a madman. I think Zikara read a thread about what happens when I try to think of names lol. Basically, don't try to force it, go for it if you can, but if you try to cram it, it will probably not be the best quality. (There are a few exceptions of course, I heard 3J made OMS in three days)
On a side note, way to go with joining the Air Force, and try not to hate basic too much lol, in the AFJROTC, one of my friends came back to class to give a briefing about basic, so I hope your not modest because they make you stand out in the cold morning air in nothing but your underwear. Males are also issued tighty-whities and females granny panties, and if you wear glasses like me, you will be issued a BCG. That stands for Birth Control Glasses by the way lol. Plus you get fed worse than people in military prisons. I'm only 16 myself, but as I said before, I am in the local AFJROTC unit, and I plan to go into the Air Force as a JAG officer.