Just watch out, there's some guy that hits every B-52 story and insists that it's BUF with one F.
Maybe he's given up now that he's been shown the error of his ways, but probably not.
My father's Godson guarded them at Offut in the seventies. He first told me the acronym and it's meaning. He told me it was BUFF with two Fs.
Being twelve or thirteen at the time, I was mighty impressed with that "cool" nickname.