U.S. troops and Polish soldiers prepare to upload a mock patient onto a UH-60 Black Hawk medevac helicopter while participating in a mass casualty exercise at an undisclosed location in Afghanistan, Dec. 23, 2017. The training prepares the troops for a real-world emergency. The soldiers are assigned to the South Carolina National Guard, Illinois National Guard, Iowa National Guard and active duty soldiers providing aviation capabilities using AH-64 Apaches, UH-60 Black Hawks and CH-47 Chinook helicopters supporting missions in Afghanistan. Army National Guard photo by Capt. Jessica Donnelly