U.S. Army Spc. Zachary Nattrass, a vehicle gunner assigned to Distribution Platoon, Company G, 3rd Battalion, 320th Field Artillery Regiment, 3rd Brigade Combat Team, 101st Airborne Division (Air Assault), conducts a class on safety and proper usage of the M2 .50-caliber machine gun for Afghan National Army (ANA) soldiers in Qalandar district, Khost province, Afghanistan, Jan. 8, 2013. The class was held in conjunction with a partnership mission to assist ANA forces with security in their area of operations. (U.S. Army photo by Spc. Brian Smith-Dutton/Released)