An M4 carbine lies on a cleaning table in the 307th RED HORSE Squadron compound at Barksdale Air Force Base, La., Sept. 11, 2014. More than 170 Airmen from both the 307th RHS and 307th Civil Engineer Squadron participated in a bivouac designed to complete yearly requirements in field and contingency skills training. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)