Buzz Aldrin interviewed in Vanity Fair:
A couple of years ago you hinted that you might've seen a UFO during a space mission. Is it possible you were just looking at floating bags of your own poo?
(Laughs.) No, not at all. They were very close. We could certainly tell what they were.
"Buzz Aldrin Is Not All That Impressed With Walking on the Moon" (via The Anomalist)
As commenters pointed out, Buzz is actually saying the bags of dumped poop were very close, not the UFOs. However, the article also links to Buzz talking about UFOs in this YouTube video. Important to note though is that in a recent Skeptical Inquirer article, Aldrin says his comments on the UFO "sighting" have been taken out of context over the years.
