Participants work to complete pull-ups at the Memorial Day CrossFit “Murph” May 23, 2013, on Andersen Air Force Base, Guam. The workout consisted of a one-mile run, 100 pull- ups, 200 pushups, 300 squats, then another one-mile run to pay homage to service members who made the ultimate sacrifice in the line of duty. (U.S. Air Force photo by Airman 1st Class Mariah Haddenham/Released)