The F-15 Eagle is a fighter jet that originally made by McDonnell-Douglas (later Boeing). It is known around the world for its toughness and "undefeated" record, meaning that it has never been shot down by an enemy plane. It is used primarily by the United States Air Force, but it is also used in Israel, Japan, Saudi Arabia and South Korea. It usually carries missiles and an M61 Vulcan gun to shoot down enemy fighter jet planes. More than a thousand have been made.