Dustin Born, 28th Civil Engineer Squadron deputy chief of operations, completes a mental obstacle during the 2012 Mud Run at Ellsworth Air Force Base, S.D., Oct. 23, 2012. The obstacle challenged participants to memorize household items at the beginning of the race and list them at the finish line. Participants had an additional 30 seconds added to their overall time for every incorrect answer. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)