A man-portable surface to air missile (or SAM) used by the US Army to shoot down enemy aircraft. Because the Army hasn't operated without USAF air superiority since Vietnam, none have been fired in combat.
Originally called the REDEYE II, it was scheduled to replace the REDEYE in 1971. It was renamed "Stinger" in 1972, and the contract for engineering development was awarded to General Dynamics that June.
The Stinger is also pretty good as currency in politically/economically unstable countries with tinpot dictators or insane despots. There are roughly 250 Stingers to the Huey, although exchange rates vary based on local flying conditions.