U.S. soldiers assigned to Charlie Company, 94th Brigade Support Battalion, Task Force Dagger, Brigade Special Troops Battalion, 4th Brigade Combat Team, 10th Mountain Division, carry an Afghan Security Guard with simulated injuries off a truck during a Mass Casualty (MASCAL) exercise on Forward Operating Base Fenty, Nangarhar province, Afghanistan, Oct. 19, 2013. A MASCAL is an exercise where soldiers demonstrate their medical knowledge in a controlled environment and are evaluated on their performance. (U.S. Army photo by Spc. Vang Seng Thao/Released)