Special tactics Airmen bow their heads during a moment of prayer before the start of the 2015 Special Tactics Memorial Ruck March at Joint Base San Antonio-Lackland, Texas, Oct. 4, 2015. The march covered 812 miles with every Airman carrying a 50-pound ruck, ending at Hurlburt Field, Fla. The march is to bring awareness to the service and sacrifice of special tactics members and in memory of fallen comrades since 9/11/01. (U.S. Air Force photo by Senior Airman Taylor Curry)