Ruhrstahl X-4 Missile at the Udvar-Hazy Center

Ruhrstahl X-4 Missile at the Udvar-Hazy Center

The German X-4 was a small air-to-air missile of World War II that could be fired at heavily armed Allied bombers from a distance. To prevent jamming, guidance was by wires running between the missile and its launch aircraft rather than by radio.