Mark Irby "MRT" Fox (born March 1, 1956) is a retired United States Navy vice admiral who served as the Deputy Commander of United States Central Command (CENTCOM).

[2] He also previously served as the Commander of the Naval Strike and Air Warfare Center at Naval Air Station Fallon, Nevada, and as Communications Division Chief, American Embassy Annex, Baghdad, Iraq.

In October 2006, then-Rear Admiral Fox completed a tour as the Deputy Assistant to the President and Director of the White House Military Office (WHMO), responsible for overseeing all military support to the President of the United States.

Fox's combat highlights include scoring the first navy MiG kill of Operation Desert Storm prior to dropping his bombs on an airfield in western Iraq on January 17, 1991, and leading the opening "Shock and Awe" strike of Operation Iraqi Freedom on March 21, 2003.

Shore tours include duty as an A-7E Instructor Pilot in Attack Squadron 174; a tour as the Light Attack/Strike Fighter Junior Officer Detailer in the Naval Military Personnel Command; assignment as Aide and Flag Lieutenant for Commander, Naval Air Force, United States Atlantic Fleet; Aide and Flag Lieutenant to the Assistant Chief of Naval Operations (Air Warfare – OP-05); joint duty as the Maritime Plans Officer at Supreme Headquarters Allied Powers Europe in Casteau, Belgium; and service as the Joint Strike and Aviation Programs Liaison Officer in the Navy's Office of Legislative Affairs in Washington, D.C. Fox retired from the navy in April 2016, and in June 2016 joined Huntington Ingalls Industries as Newport News Shipbuilding Vice President of Customer Affairs.