An U.S. Army M1 Abram, assigned to the 4th Infantry Division, stands silent after a full day of force battle tactics at Fort Irwin, Calif., Oct. 25, 2012. The National Training Center trains the transformed Army by conducting force-on-force and live-fire training for ground and aviation brigades in a joint scenario across the spectrum of conflict, using a live-virtual-constructive training model. (U.S. Air Force photo by Staff Sgt. Michael C Zimmerman/Released)