A Bell OH-13 Sioux light observation helicopter sits parked at the U.S. Army base camp at Cu Chi, South Vietnam, in 1967. Known for its distinctive glass 'bubble' canopy, the OH-13 served American air cavalry and reconnaissance units in scouting and command-and-control roles throughout the early years of the Vietnam War. The red horse insignia on its nose reflects the cavalry heritage carried into the helicopter age by many Army aviation units. Project: 218544