U.S. Army Staff Sgt. Hector Hoyas (right), an aerial delivery field service department instructor, and Air Force Senior Airman Matthew Phillips, an airborne pavements and equipment operator from the 820th Rapid Engineer Deployable Heavy Operational Repair Squadron Engineer (RED HORSE) Squadron, turn away from the rotor wash as a Nevada National Guard CH-47 Chinook helicopter takes off with a Humvee at Nellis Air Force Base, Nev., during sling-load training on April 15, 2011.