I'm assuming he means at USAFA since it's on that forum, but still not much help. I just asked my son who's a sophomore there and he also didn't know what that would refer to (and he asked his roommates as well), nor did he know where those briefings were held anymore - I do know if it's for a candidate visit he went to Harmon Hall 3 years ago for it as someone else suggested. So per current cadets at least that's not a normal name for a building at USAFA.