The Secretary of the Army may authorize the extension of temporary Federal recognition as an officer of the Army National Guard to any person who has passed the examination prescribed in section 307(b) of this title, pending his appointment as a reserve officer of the Army. The Secretary of the Air Force may do likewise for a person who has passed that examination pending his appointment as a reserve officer of the Air Force. Temporary recognition so extended may be withdrawn at any time. If not sooner withdrawn or replaced by permanent recognition upon appointment as a reserve officer in the same grade, it terminates one year after its effective date.

To be eligible for temporary Federal recognition under subsection (a), a person must take an oath that during the period of temporary recognition he will perform his Federal duties as if he had been appointed as a reserve officer of the Army or the Air Force, as the case may be.