U.S. Army National Guard Sgt. 1st Class Michael Huitema, 109th Regional Support Group detachment sergeant pins Joe Reiter, Lead, S.D., paramedic, to the ground during a women’s self-defense training seminar at Ellsworth Air Force Base, S.D., March 14, 2016. Brazilian jiu-jitsu is a martial art, combat sport and self-defense system that focuses on grappling and ground fighting. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)