U.S. Air Force Capt. Ryan Kiggins, left, and other personnel observe as personal security detail members zero-in their weapons at a range near Kabul, Afghanistan, Dec. 8, 2015. Zeroing weapons is crucial for accurate marksmanship. Kiggens is a security forces member assigned to the Train, Advise, Assist Command-Air . U.S. Air Force photo by Staff Sgt. Corey Hook