Spc. Byron Estavillo, a forward observer in Blackfoot

Spc. Byron Estavillo, a forward observer in Blackfoot Troop, 6th Squadron, 4th Cavalry Regiment, Combined Task Force Duke, gazes downrange at the rounds being called in during a fire support coordination exercise at Combat Outpost Khilaguy, Afghanistan, on Aug. 22, 2013. An Apache helicopter moves into position in the background to engage the target following the indirect fires. The 6th Squadron, 4th Cavalry Regiment, 3rd Brigade Combat Team, 1st Infantry Division, from Fort Knox, Ky., in support of Operation Enduring Freedom. (U.S. Army photo by 1st Lt. Charles Morgan, Blackfoot Troop, 6th Squadron, 4th Cavalry Regiment, 3rd Brigade Combat Team, 1st Infantry Division/Released.)