use canned tunafish and eat raw vegetables from the commissary.
use the coffeemaker to boil the water and steep the oatmeal in it.
for losing bodyfat, skip the white rice and just eat the vegetables and chicken.
get egg beaters at the commissary, they are pasturized and throw it in the protein shake too, you don't have to cook them.
I got gerber baby bananas for after workout at the commissary too.
If you are living at the Q, they should have a barbeque somewhere in the common area. Just get some chicken and grill it all at once and put it in the freezer. of course you pay for the charcoal
another trick is to get frozen veggies and just put some in a ziplock and take it with you in the morning. by the time you are ready to eat it, they will be thawed, and you can nuke them for like a minute to eat in the schoolhouse.
if you can get hardboiled eggs at the galley, get a lot and then take some with you when you leave.
go through the speedline for hardboiled eggs then go through the regular line to get scrambled to eat there, and the lunchladies will be different and won't know you went through both lines
for losing fat, I also recommend cardio at the gym before breakfast, the eating lots for breakfast, including carbs. you can get oatmeal and fruit for breakfast.
When I was living out of the Q I did cardio in the am early, went to galley for breakfast, then school/class etc, then didnt have time to workout at lunch AND walk to the galley, so I just ate lunch there, and when class let out I see if I had time to workout before the galley closed. If so I did, if not I ate dinner, then worked out again with weights. just have a shake after workout and then bed. pretty good routine.
I lost about 10-15lbs in about 10 weeks, doing 2 a day workouts. did weights 3x a week and cardio every day. the days I didnt have weights I just did cardio 2x a day instead. train your whole body everytime.
of course there is the obvious like no drinking, get lots of sleep, etc to lose weight
good luck, it can be done with patience and dedication. being in a static environment is great compared to a ship, take advantage of your time there and show up looking good to your next command!