FIRE POWER An M1A1 Abrams tank fires its 120-mm main gun toward a target during a Marine Corps exercise to evaluate combat readiness on Marine Corps Air Ground Combat Center in Twentynine Palms, Calif., Jan. 20, 2015. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 144076-M-UWO38-834.jpg Photo Gallery