U.S. Marine Corps Gen. James F. Amos, the commandant of the Marine Corps, delivers opening remarks for Expeditionary Warrior 2013 at George Mason University's Mason Inn Conference Center & Hotel in Fairfax, Va., Feb. 25, 2013. Expeditionary Warrior is a synthetic war game simulating potential conflicts taking place in 2024. (U.S. Marine Corps photo by Sgt. Mallory S. VanderSchans/Released)