Operation High Dive
Operation High Dive was a secret project carried out during the 1950s by the United [States Air Force]. It tested high-altitude parachutes using anthropomorphic dummies. The dummies went into a 200 rpm Flat [spin (aviation)|flat spin], which would be fatal to a human. Further investigations on this led to Project Excelsior. It may later have been confused with Project Mogul and thus helped form the account of the Roswell incident.