(b) REQUIREMENT FOR APPOINTMENT.—(1) The President may ap-
point an officer as Chairman of the Joint Chiefs of Staff only if the
officer has served as—
"(A) the Vice Chairman of the Joint Chiefs of Staff;
"(B) the Chief of Staff of the Army, the Chief of Naval
Operations, the Chief of Staff of the Air Force, or the Com-
mandant of the Marine Corps; or
"(C) the commander of a unified or specified combatant
command.
(Goldwater-Nichols Act)