Participants in the 2015 Special Tactics Memorial Ruck March start start the event on Joint Base San Antonio, Oct. 4, 2015. The march covers over 812 miles, ending at Hurlburt Field, Fla., in memory of comrades who have fallen since Sept. 11, 2001. Each Airman participating carries a 50-pound ruck sack to bring awareness to the service and sacrifice of Special Tactics members. U.S. Air Force photo by Senior Airman Keith James