Equestria Daily posted a picture of a genuine US Navy brony (that’s a male fan of My Little Pony: Friendship Is Magic) wearing a very unofficial Rainbow Dash patch. (Scroll down through the news roundup post.)
In the comments, Navy Brony himself turns up. It turns out that he’s a rescue swimmer. Anybody willing to get out of a perfectly good helicopter, in order to jump into the ocean to save people, is apparently tough enough to be a fan of whatever he wants. Even a teenage girl pegasus. (Uniform issues are also explained.)
A much older unofficial pegasus patch was also linked in the comments….