sentences:  Shortly thereafter, frontman Dave Mustaine composed the bulk of the music.The intro is a rapidly strummed version of the D minor arpeggio that Mustaine wrote for the Metallica instrumental track "The Call of Ktulu", which was the final Metallica song for which he was given writing credit.Hangar 18 is located at Wright-Patterson Air Force Base near Dayton, Ohio, and it is speculated that an alien aircraft was brought there from Roswell in 1947.