Its not just the commissary. The entire way the military works is functional communism. Housing is assigned by rank, is available to anyone currently in contract, as well as healthcare and obviously, work. Pay is rated by rank and not by position, a Physician assistant gets the same rank pay as a Lt working command staff in any other unit. There is no capitalism in the DoD at all not even under their procurement systems.

Base pay may be the same, but there are several incentive pays available for various duties. Flight pay, sea pay, jump pay, hazardous duty pay, etc.