A Mi-17 from the Afghan air force prepares to land, May 8, 2018, at the Regional Military Training Center-Kandahar during a medical evacuation exercise hosted by Soldiers from the 2nd Battalion, 1st Security Force Assistance Brigade in Kandahar Afghanistan. “The Afghan army has taken severe casualties over the past year-and-a-half and they’ve stayed in the field fighting,” Defense Secretary James N. Mattis said. (U.S. Army photo by Staff Sgt. Neysa Canfield/TAAC-South Public Affairs)