U.S. Marine Corps Cpl. Ian Kozlik, 2nd Law Enforcement Battalion military working dog handler, and MWD Ppatriot run through a mud pit during a team endurance challenge as part of the second annual East Coast Iron Dog competition Oct. 23, 2018, at Seymour Johnson Air Force Base, North Carolina. Teams were required to run more than one and a half miles, while traversing through various obstacles and competing for fastest time. (U.S. Air Force photo by Airman 1st Class Shawna L. Keyes)