B-2 spirit is an aircraft made to carpet bomb the shit out of any target as necessary, however, only 21 have ever been built, all owned by the United States air force. 20 are active at the moment because one of them, "The spirit of Kansas" exploded in 2008. They are commonly called "Stealth bombers" due to their appearance in Call of duty: Modern Warfare 2, coupled with the fact that they are a stealth aircraft, and almost undetectable by radar. The one and only time they have been used outside of testing was in 2003.
BOB: WOAH WTF IS THAT THING IN THE AIR THAT IS DROPPING BOMBS@@@
BILLY: Dude, u havent played modern warfare 2 yet? its a B-2 Spirit stealth bomber.
BOB: Oh ok.