Army..never asked?

This is a question that I can't find anybody ever asking,so I think I'm safe.I have made huge gains naturally and was about to start my first cycle to knock it up a notch,but I just got orders to report to 4 months of training to deploy to Baghdad by Mar.I want to keep my gains as long as I can and/or benefit from my P.T. since my regular lifting days are over for a while.So my questions are....what can I take to keep my gains for as long as I can w/o regular lifting and is there something to help me get 100% out of just my P.T.?I'm not going to bother to do my original cycle 'cause I'm not going to lift enough.

Just keep your calories as high as you can and get as much exercise as you can. push ups pull ups etc..

Thats' all I could think of also.The Army's P.T. isn't for building huge muscles,so I know I'll have to do P.T. on my own.