U.S. Air Force Senior Airman Dennis Wilson from Greensboro, N.C., with the 567th Rapid Engineer Deployable Heavy Operational Repair Squadron Engineers out of Seymour Johnson Air Force Base, North Carolina, hammers a stake into a cinder block during the construction of a school at Estanzuelas, El Salvador, May 3, as part of Beyond the Horizon 2015. BTH15 is a humanitarian and civic assistance mission designed to help build schools, clinics and provide medical care for the people of El Salvador.