U.S. Army Sgt. 1st Class Edward Barnett, right, and Spc. James Brown inspect the position of their M1A2 Abrams tank during Exercise Peace Sentinel at Novo Selo Training Center, Bulgaria, Nov. 23, 2015. Barnett is a tank commander and Brown is a gunner, and both are assigned to the 3rd Infantry Division’s 5th Squadron, 7th Cavalry Regiment. U.S. Army photo by Staff Sgt. Steven M. Colvin