Man o man, i dunno if you can bulk up in the army. I remember doing marine PFT and any pound of muscle you put on your body that doesn't add to efficiency is gonna get burned up right away. Way too much running, and body weight exercises. you can still get pretty cut up with some light lean mass though. in the army im not sure if you guys pft for pull ups? just hitting 20 of those for the 100% score and the push ups should make ya look cut up after that running.