 Three NFOs have reached four star rank, one as a Marine Corps general having served as the Assistant Commandant of the Marine Corps, and the other two as Navy admirals, one having served as Vice Chief of Naval Operations before commanding U.S. Fleet Forces Command & U.S. Atlantic Fleet, U.S. Pacific Command (USPACOM) and U.S. Central Command (USCENTCOM), and the other having commanded U.S. Pacific Command, having previously commanded U.S. Pacific Fleet.Another former NFO who retrained and qualified as a Naval Aviator also achieved four star rank as a Marine Corps general, commanded U.S. Strategic Command (USSTRATCOM) and later served as Vice Chairman of the Joint Chiefs of Staff (VCJCS).In some quarters, NFO careers may be viewed more restrictive than their Naval Aviator (e.g., pilot) counterparts.