U.S. Army Staff Sgt. David Scott, Fort Eustis Modern Army Combatives Program instructor, plays with his son and another student before Brazilian jiu-jitsu class starts in Yorktown, Va., Nov. 21, 2013. Scott’s family life revolves around martial arts: his son participates in a BJJ class and his wife works as an administrator for the BJJ school. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)