Airman 1st Class Zachary Brown, top, and Senior Airman Scott Allen, both members of the 921st Contingency Response Squadron Air Transportation Flight, tussle to gain the dominate position during a combative class March 29, 2016, at Travis Air Force Base, California. The five day training course was designed to improve how contingency response Airmen are trained in air base opening combat skills. (U.S. Air Force photo by Staff Sgt. Robert Hicks/Released)