U.S. Air Force Staff Sgt. Dennis Kim, a 35th Security Forces Squadron military working dog handler, and MWD Drake low crawl through an obstacle during the Winter Warrior Challenge at Misawa Air Base, Japan, Dec. 13, 2017. The MWD handlers wore individual protective equipment and a ruck sack with water and veterinarian medical supplies weighing around 55 pounds throughout the competition. (U.S. Air Force photo by Staff Sgt. Melanie Hutto)