Gary McKinnon, the guy that gained access to computers at NASA by using their own administrator passwords (apparently they weren’t using any passwords as they were left blank) gives an interview to Wired News about what he found and his 70 year prison sentence for revealing what he found.

[...] I also got access to Excel spreadsheets. One was titled “Non-Terrestrial Officers.” It contained names and ranks of U.S. Air Force personnel who are not registered anywhere else. It also contained information about ship-to-ship transfers, but I’ve never seen the names of these ships noted anywhere else. [...]

http://www.wired.com/