An M1A1 Abrams tank with Company B, 1st Tank Battalion, fires a round from its main gun during a tank assault course for exercise Gold Eagle 2013 in the Combat Center’s Prospect Training Area June 30, 2013. Gold Eagle paired 1st Tanks and soldiers with B Squadron, 1st Armoured Regiment of the Australian Army. (Official USMC photo by Cpl. William J. Jackson/released)