Brigadier Gen. Rex C. McMillian, commander, 4th Marine Aircraft Wing exchanges the 4th Marine Aircraft Wing’s guidon with Maj. Gen. John Croley, during a change of command ceremony. The official guidon exchange made McMillian commander of the wing. Croley is slated to become commander of Marine Forces South and deputy commander, Marine Forces Command. - Brigadier Gen. Rex C. McMillian, commander, 4th Marine Aircraft Wing exchanges the 4th Marine Aircraft Wing’s guidon with Maj. Gen. John Croley, during a change of command ceremony. The official guidon exchange made McMillian commander of the wing. Croley is slated to become commander of Marine Forces South and deputy commander, Marine Forces Command.