If you REALLY want to know, you could do this: First, you have to find out if such an incident occured, where it would have been recorded (ie Navy, Air Force, FAA files etc.) Call the National Archives and the friendly (I'm not kidding, the archivists at College Park are the most helpful government employees I've ever met) will be able to give you a good idea of where such an incident would be recorded. If they don't know, they will find out and contact you promptly (less than a week) with what they've found. Then you fill out a FOIA request for said documents. If the incident occured in the 1950s-early 80s it should be declassified. Documents older than 25 years are automatically declassified unless the issuing agency (DOD, DOJ, etc.) deems that they are still sensitive and that they're declassification would still be a threat to national security. Then you wait, and wait, and wait, and wait, and by the time you have completely forgotten that you ever even filled out the FOIA, the file will arrive in the mail and any parts that are still classified will be blacked out. OR, the next time you are in the Washington D.C./ College Park area you can visit the archives yourself and make copies of the files. When I was doing research I chose the latter since I have heard stories about the FOIA backlog being insane.