Ever since a UFO or flying saucer allegedly crashed in the desert outside Roswell, New Mexico, more than 70 years ago, it has been claimed the remains were stored at one of two secretive US Air Force military bases.
One is top-secret Area 51 in Nevada, the other is the Wright-Patterson US Air Force test and research base at Dayton, Ohio.
The latter is actually where the US Air Force confirmed it took the remains to straight away, but some conspiracy theorists believe they were later moved to Area 51.
Roswell has been at the heart of the UFO scene since in July 1947 the military sensationally announced in a press release it had found the remains of a crashed flying saucer in the desert nearby.
But the following day it retracted the statement, saying it was in fact a damaged US Air Force air balloon.
Witnesses later came forward to say there had been alien bodies within the "crashed craft", which along with the wreckage were then taken to a mysterious top-secret military base.
There have been many theories about what actually happened, but an official government probe into what happened concluded it was a secret spy balloon being tested.
Hoping to shed some light on the mystery is Raymond Szymanski, 65, from Dayton, Ohio, who spent 39 years working at Wright-Patterson until retiring in 2011.
To read more, click here.