Pub. L. 83-773, tit. III, subtit. F, sec. 335
appointment in appropriate higher grade after temporary appointment
appointment in appropriate higher grade after temporary appointment Sec. 335. A Reserve officer on active duty who holds an appointment in a temporary grade higher than his current grade shall be appointed, or if he is an officer in the National Guard of the United States shall be eligible to be appointed, to an appropriate higher grade but not above colonel equal to or lower than his temporary grade when he has completed the years of service for the appropriate higher grade to be prescribed by the Secretary annually which shall conform as nearly as possible to the corresponding periods of total service upon which Regular officers are then being promoted.