Sky Security A CH-47 Chinook helicopter crew chief keeps watch during a flight over Kabul, Afghanistan, April 24, 2017. The helicopter was carrying Defense Secretary Jim Mattis as he visited the country. DoD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley SHARE IMAGE: Download Image: Full Size (3.14 MB) Photo By: Tech. Sgt. Brigitte Brantley VIRIN: 170424-D-GO396-0782C.JPG Photo Gallery