Encounter Atlas
Why it matters
The first official admission that the 1947 "weather balloon" story was a cover for something classified, just not a spacecraft.
Official releases / USUnited States
Report of Air Force Research Regarding the "Roswell Incident"
Prompted by a congressional records search, the Air Force concluded that the 1947 Roswell debris came from Project Mogul, a then-secret string of balloons and radar reflectors meant to listen for Soviet nuclear tests.