Pub. L. 83-773, tit. III, subtit. A, sec. 305
constructive credit appointments
constructive credit appointments Sec. 305. (a) Upon initial appointment as a Reserve officer, the grade of a person credited with service under section 201 shall be as follows: Years of service credited Grade Less than three Second lieutenant. At least three, but less than seven First lieutenant. At least seven, but Jess than fourteen Captain. At least fourteen, but less than twenty-one Major. At least twenty-one Lieutenant colonel. At least twenty-three Colonel or lieutenant colonel, as the Secretary determines. (b) For a person appointed in a grade below colonel, any period of service credited under section 201 or under (c) which is in excess of the minimum years of service required under (a) for the grade in which appointed shall be credited as promotion service. (c) A person heretofore initially appointed as a Reserve officer in the lowest grade of a special branch, having held no prior appointment as a commissioned officer of the Armed Forces, may for the purposes of this title be credited with the amount of service in an active status prescribed in section 201 as a minimum amount of service for the appropriate branch.