Airman 1st Class Sadie Colbert, 28th Bomb Wing Public Affairs photojournalist, gets her lap counter checked off during the Rucksack March 10K at Ellsworth Air Force Base, S.D., March 11, 2016. The event was hosted by the Bellamy Fitness Center as a way to promote physical fitness and team cohesion. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)