The following link to a PDF file from the FBI plainly states that the Roswell event actually took place. Does it really matter? Most Americans already believe in "aliens". The main disputable point is their origin.
http://vault.fbi.gov/hottel_guy/Guy%20H ... f%201/viewThe following link to a PDF file from the FBI plainly states the hexagonal discs recovered at Roswell were attached to a balloon:
http://vault.fbi.gov/Roswell%20UFO/Rosw ... f%201/viewLOL ...

The latter message is from 1947 and the first message dated 1950 so who knows for certain if these two messages refer to the same event. By the date on the second message, July 8, 1947, the alleged cover-up by the military was in full swing.