Well, they were green, but it was strange anyway.
I was on campus for Lindy on Sproul early on Saturday afternoon, when all of a sudden there was a loud propeller noise. I looked up and saw two giant green military transport helicopters, the two-rotor (one front, one rear) sort. I stopped dancing and pointed them out to my partner. They circled above us, more or less around Sproul Plaza, once, then circled elsewhere over campus, and then left. The whole event lasted less than a minute, but at some points they were really loud. Everyone stopped dancing to watch, and I think someone even turned off the music.
I don’t know why they were there, but I was pretty excited about it.