U.S. Air Force airmen from the 820th Red Horse airborne flight, wait for the Nevada Army National Guard 1st Battalion, 189th Aviation Company CH-47 Chinook helicopter to pick-up a heavy equipment sling-load at Nellis Air Force Base, Nev., July 23, 2011. Members of the Nevada Army National Guard and the 820 RHS airborne flight trained together to improve their interoperability while conducting air drops and sling-load operations.