U.S. Marines with Delta Company, 1st Tank Battalion, 1st Marine Division, inspect an M1A1 Abrams after completing a night mission during Exercise Steel Knight 14 aboard Marine Corps Air Ground Combat Center, 29 Palms, Calif., Dec. 12, 2013. Exercise Steel Knight 14 is a 1st Marine Division exercise conducted to successfully demonstrate the capability to exercise command and control over forces in a distributed environment with long range movement, while conducting offensive and defensive maneuver and operations integrated with supporting arms. (U.S. Marine Corps photo by Cpl. Luis A. Vega, 1st Marine Division Combat Camera/ Released)