 In August 2002, Amos was promoted to major general and assumed command of the 15,000 Marines of the 3rd Marine Aircraft Wing based out of Miramar, California, leading them in combat twice between 2003 and 2004 during Operations Iraqi Freedom I and II.Receiving his third star in 2004, Lieutenant General Amos assumed command of the 45,000+ Marines and sailors of the II Marine Expeditionary Force at Camp Lejeune, North Carolina.In 2006, he was reassigned as the commanding general, Marine Corps' Combat Development Command, and as the Deputy Commandant for Combat Development and Integration, at Quantico, Virginia, where he was responsible for the training of all Marines, their combat units, their continuing education, and for the identification of all Marine equipment requirements.