U.S. Army Staff Sgt. David Scott, right, Fort Eustis Modern Army Combatives Program instructor, teaches Sgt. Nicholas Martinez, bottom left, and Pvt. Cameron Johnson, both MACP students, how to move into a side position during MACP training at Fort Eustis, Va., Nov. 18, 2013. Scott spends most of his free time either training with his son, teaching classes after work or training to improve his muay thai and Brazilian jiu-jitsu. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)