U.S. Army Cpt. Jared Sunsdahl, left, and 1st Lt. Andew Corbett brief Army Chief of Staff Gen. George W. Casey Jr. about their unit's training exercise at the National Training Center on Fort Irwin, Calif., Jan. 22, 2011.

The center's mission is to provide realistic, joint and combined arms training in multinational venues in a contemporary operating environment to assist commanders and soldiers by presenting current problem sets.

U.S. Army photo by D. Myles Cullen