Amends the statute governing credit for service when an officer is appointed for completing Senior Reserve Officers’ Training Corps (SROTC). It inserts two dated rules — one referencing August 1, 1979, and one referencing the act’s enactment date — to clarify which SROTC service periods count for appointment credit and states the rule applies regardless of which component (active, reserve, Guard) performed the service.

The change is a narrow technical clarification about how SROTC time is counted for officers appointed on completion of the program; it affects personnel records, entitlement calculations (time-in-service credit), and administrative processing across Defense personnel offices.