((a)) ** .—** 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.
((b)) ** .—** An officer may not be authorized to wear the insignia for a grade as described in subsection (a) unless—
((1)) the Senate has given its advice and consent to the appointment of the officer to that grade;
((2)) the officer is serving in, or has received orders to serve in, a position for which that grade is authorized; and
((3)) in the case of an officer selected for promotion to a grade above colonel or, in the case of an officer of the Navy, a grade above captain—
((A)) authority for that officer to wear the insignia of that grade has been approved by 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); and
((B)) the Secretary of Defense has submitted to Congress a written notification of the intent to authorize the officer to wear the insignia for that grade.
((c)) ** .—**
((1)) Authority provided to an officer as described in subsection (a) to wear the insignia of the next higher grade may not be construed as conferring authority for that officer to—
((A)) 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
((B)) assume any legal authority associated with that grade.
((2)) The period for which an officer wears the insignia of the next higher grade under such authority may not be taken into account for any of the following purposes:
((A)) Seniority in that grade.
((B)) Time of service in that grade.
((d)) ** .—**
((1)) The total number of colonels, Navy captains, brigadier generals, and rear admirals (lower half) on the active-duty list who are authorized as described in subsection (a) to wear the insignia for the next higher grade may not exceed 85.
((2)) The number of officers of an armed force on the active-duty list, or for the Space Force, the Space Force officer list, who are authorized as described in subsection (a) to wear the insignia for a grade to which a limitation on total number applies under for a fiscal year may not exceed 1 percent, or, for the grades of colonel and Navy captain, 2 percent, of the total number provided for the officers in that grade in that armed force in the administration of the limitation under that section for that fiscal year.