There can be few people within the Ufological arena who are unaware of the United States Air Force's view on what did - or, indeed, did not - happen in the desert outside of Roswell, New Mexico in July 1947.
The USAF's reports of 1994 and 1997 spell out the Air Force's position perfectly and graphically.
Commenting on the Air Force's report on Roswell, in 1995 the General Accounting Office advised the late New Mexico Congressman Steven Schiff (who, in the spring of 1993, had begun to make inquiries with the Defense Department in an attempt to determine the truth surrounding certain aspects of the Roswell controversy) that while it now seemed unlikely that the weather balloon explanation for Roswell was correct, the Air Force had come to yet another conclusion in its attempt to lay the mystery of Roswell to rest.
Read more at http://theunexplainedmysteries.com/roswell.html