The governing regulation for Basic Allowance for Subsistence is the Department of Defense Financial Management Regulation 7000.14-R, (DODFMR) Volume 7A, chapter 25.
Retroactive payment of Basic Allowance for Subsistence is not authorized in accordance with MILPERSMAN article 1746-020, paragraph 2d.
In summary, three items are required:
1. Special request approved by Commanding Officer;
2. Special request approved by Galley Food Service Officer; and
3. Modification of Meal entitlement code on service member's Common Access Card (CAC).