An Afghan air force Mi-35 fires 23 mm rounds from newly mounted twin-barreled Gryazev-Shipunov GSh-23 guns for the first time May 15, 2013, south of Kabul, Afghanistan. This live-fire exercise marked the first time in history that the Afghan air force has had all three weapons systems installed on the helicopters, including the GSh-23, the Yak-B 12.7 mm machine gun and the S-5 57mm rocket pod. (U.S. Air Force photo)