U.S. Army Reserve Troop List Unit Soldiers are tested on their knowledge of the Mark 19 40 mm grenade machine gun by Sgt. Michael Llantada, primary marksmanship instructor, during Operation Cold Steel II, hosted by the 79th Theater Sustainment Command at Fort Hunter Liggett, Calif., Nov. 9, 2017. Operation Cold Steel is the U.S. Army Reserve’s crew-served weapons qualification and validation exercise to ensure that America’s Army Reserve units and Soldiers are trained and ready to deploy on short-notice as part of Ready Force X and bring combat-ready and lethal firepower in support of the Army and our joint partners anywhere in the world. (U.S. Army photo by Staff Sgt. Debralee Best/TF Cold Steel II)