Mattis Handshake Defense Secretary Jim Mattis greets Army Command Sgt. Maj. David Clark, left, Resolute Support senior enlisted leader, and Army Maj. Gen. Christopher Haas, Resolute Support deputy chief of staff for operations, at the mission's headquarters in Kabul, Afghanistan, April 24, 2017. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (0.39 MB) Tags: resolute support, secdef, central command, centcom, travels, afghanistan, jim mattis Credit: Tech. Sgt. Brigitte N. Brantley VIRIN: 170424-D-GO396-0086.JPG Photo Gallery