U.S. Army Sgt. 1st Class Edward Barnett, right, and Spc. James Brown place small trees for concealment at the front of the battle position for their hull-down 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, assigned to the 3rd Infantry Division’s 5th Squadron, 7th Cavalry Regiment. U.S. Army photo by Staff Sgt. Steven M. Colvin