Documented sightings reported in 1971.
A teenager witnessed a glowing object that left a hydrophobic ring in the soil with anomalous chemical properties persisting for years.
The Air Force allegedly filmed a UFO landing at Holloman AFB and offered the footage for a documentary before withdrawing it at the last moment.
A Costa Rican government mapping camera accidentally captured a sharply-resolved 210-foot disc hovering above Lago de Cote during a 1971 survey flight - the crew never saw it visually, and the calibrated negative remains in the national archives.
Apollo 14 lunar module pilot Edgar Mitchell - the sixth man on the Moon - became the most prominent US astronaut to publicly assert that the Roswell incident was real and that ETs visit Earth.