IIRC a Vulcan on a Red Flag exercise or similar evaded/jammed US air defence and "bombed" Washington. Red faces all around. The Vulcan was pretty stealthy due to its shape when seen end on (or sideways).
I'm sure there's another similar story of a Vulcan puling up to reveal 2 Tornados which had "hidden" behind it, which promptly bombed their target!
There is definitely one (not sure which book) of a USAF squadron leader or similar having a large picture on his office wall of a part circle caved into the desert.....by a Vulcan flying low level in a turn!
Like most (but possibly more so) the US doesn't like being proved second best!