Radar pictures eliminated!!

A while ago i came across some information that stated the U.S military had airbrushed out radar pictures of UFO's and had been doing it for years.
Im just wondering if anyone else had heard about this and if anyone has a link to a site that states it?

I personally think that its very possible. It would be such an easy method, it would be low cost and it could easily decieve anyone who isnt meant to know, but had come across the pictures.
What does everyone else think?

Maylian,
Go to google, type in UFO: The Greatest Story Ever Denied and do a video search. Click the video, sit back and enjoy the show. Not only do they discuss tampering at length but they also talk various other subjects that are sure to fascinate you.