Photographed at the National Museum of the Marine Corps (pronounced like "core" so don't worry, it's not a dead body museum).
The M50 Ontos, names after the Greek word for "thing", is a rocket-spewing armored-fighting-vehicle with a history almost as unusual as its head-turning appearance.
The Ontos was envisioned as an airborne tank-destroyer. Strapped to the underside of flying cargo helicopters, they would accompany American paratroopers on missions. Once on the field, the six 106mm rocket launchers that give the Ontos its bizarre appearance proved capable of fending off tanks and other heavily armored vehicles, against which the lightly armed paratroopers were dreadfully vulnerable.
Ironically, when the Ontos entered service with the US Marines during the Vietnam War, it would scarcely ever face down enemy tanks in battle. Instead, the Ontos would serve as the ultimate "Eviction Notice" by forcing entrenched foes out of heavy cover; under its already disturbing gaze, buildings were battered down by explosive rockets, and dense jungle treelines and thickets pulverized by clouds of oversized-dart-esque flechette rounds.