A Nevada Army National Guard 1st Battalion, 189th Aviation Company CH-47 Chinook helicopter carries a Caterpillar D9 bulldozer to a drop site during a training exercise with the 820th RED HORSE airborne flight July 23, at Nellis Air Force Base, Nev. 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.