U.S. Army Staff Sgt. David Scott, Fort Eustis Modern Army Combatives Program instructor, left, supervises a leg-lock technique during his Brazilian jiu-jitsu class at Yorktown, Va., Nov. 21, 2013. In addition to teaching MACP and BJJ, Scott also helps the Newport News Police Department with their martial arts and self-defense courses. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)