171023-M-ZQ619-013.JPG - Empty casings of .50 caliber ammunition during U.S. Marines with Combined Anti-Armor Team 1, 2nd Battalion, 3rd Marines, maneuver through the mobile assault course for Exercise Bougainville II at the Pohakuloa Training Area, on the island of Hawaii, Oct. 23, 2017. Exercise Bougainville II prepares 2nd Bn., 3rd Marines for service as a forward deployed force in the Pacific by training them to fight as a ground combat element in a Marine Air-Ground Task Force. (U.S. Marine Corps photo by Sgt. Ricky Gomez)