The Roswell UFO Incident involved the alleged recovery of an extraterrestrial spacecraft that crashed on a ranch near Roswell, New Mexico in 1947. The US military claimed it was debris from a weather balloon, but UFO believers argue it was evidence of a crashed alien craft and cover-up. The incident has become a widely known phenomenon and the most controversial of alleged UFO cases, sparking decades of conspiracy theories about recovered alien technology and bodies being studied by the government.