Australian Army soldiers with 1st Armored Regiment conduct a battle sight zero on seven M1A1 Abrams tanks with U.S. Marines from 1st Tank Battalion, 1st Marine Division, in order to correctly align the sights during Exercise GOLD EAGLE aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 28, 2013. Exercise GOLD EAGLE is a combat arms reciprocal exchange program which allows U.S. and Australian forces to share knowledge and improve interoperability. (U.S. Marine Corps photo by Lance Cpl. Jason Morrison, 1st Marine Division Combat Camera/ Released)