Lance Cpl. Nick Grasso, a native of Racine, Wis., left,

Lance Cpl. Nick Grasso, a native of Racine, Wis., left, and Lance Cpl. Vincent Crisomia, a native of Queen Creek, Ariz., mortarmen, Delta Company, 1st Light Armored Reconnaissance Battalion, fire their M252 81 mm mortar system in support of Exercise Steel Knight 2014 at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 12, 2013. The exercise gave the Marines the opportunity to refine and rehearse essential combat skills needed in a combat environment. Steel Knight is an annual exercise that includes elements from the entire I Marine Expeditionary Force. The exercise focuses on conventional operations and provides realistic training that prepares Marines for overseas operations. (U.S. Marine Corps photo by Lance Cpl. Christopher J. Moore/Released)