What benefit is lost upon selection to the Seaman to Admiral (STA-21) Program?

Selection for the Seaman to Admiral (STA-21) Program leads to a transition in the service member's status, specifically from enlisted to officer within the Navy. One significant change that occurs is the loss of Special Duty Assignment pay. This pay is often provided to enlisted personnel who serve in certain demanding or specialized roles but is not available to officers in the same capacity. Once a sailor enters the STA-21 program, they are no longer eligible for this type of pay as they shift into a new role and compensation structure as officers in training. Understanding this distinction is crucial for those considering the program, as it affects their overall earnings and benefits during their transition period.