Summary

the United States Government United States Code — Title 10, Subtitle A, Part II, Chapter 45

When an enlisted member of the Army National Guard or the Air National Guard who has been called into Federal service is released from that service, the exterior articles of uniform in his possession shall be accounted for as property issued to the Army National Guard or the Air National Guard, as the case may be, of the State or territory, Puerto Rico, or the District of Columbia of whose Army National Guard or Air National Guard he is a member, as prescribed in section 708 of title 32.
Source: Wikisource

the United States Government United States Code — Title 10, Subtitle A, Part II, Chapter 45

Authority.— An officer in a grade below the grade of major general or, in the case of the Navy, rear admiral, who has been selected for promotion to the next higher grade may be authorized, under regulations and policies of the Department of Defense and subject to subsection (b) , to wear the insignia for that next higher grade. An officer who is so authorized to wear the insignia of the next higher grade is said to be “frocked” to that grade.
Source: Wikisource

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