An officer serving in a grade below the grade of lieutenant general or, in the case of the Navy, vice admiral, who has been selected for appointment to the grade of lieutenant general or general, or, in the case of the Navy, vice admiral or admiral, and an officer serving in the grade of lieutenant general or vice admiral who has been selected for appointment to the grade of general or admiral, may be authorized, under regulations and policies of the Department of Defense and subject to subsection (b), to wear the insignia for that higher grade for a period of up to 14 days before assuming the duties of a position for which the higher grade is authorized. An officer who is so authorized to wear the insignia of a higher grade is said to be “frocked” to that grade.
(b) Restrictions.—An officer may not be authorized to wear the insignia for a grade as described in subsection (a) unless—
the officer has received orders to serve in a position outside the military department of that officer for which that grade is authorized;
the Secretary of Defense (or a civilian officer within the Office of the Secretary of Defense whose appointment was made with the advice and consent of the Senate and to whom the Secretary delegates such approval authority) has given approval for the officer to wear the insignia for that grade before assuming the duties of a position for which that grade is authorized; and
(c) Benefits Not to Be Construed as Accruing.—
(1) Authority provided to an officer as described in subsection (a) to wear the insignia of a higher grade may not be construed as conferring authority for that officer to—
be paid the rate of pay provided for an officer in that grade having the same number of years of service as that officer; or
(d) Limitation on Number of Officers Frocked.—
The total number of officers who are authorized to wear the insignia for a higher grade under this section shall count against the limitation in section 777(d) of this title on the total number of officers authorized to wear the insignia of a higher grade.