Bockscar, sometimes called Bock's Car or Bocks Car, is the name of the United States Army Air Forces B-29 bomber that dropped the "Fat Man" nuclear weapon over Nagasaki on 9 August 1945, the second atomic weapon used against Japan. It was assigned to the 393d Bomb Squadron, 509th Composite Group.
The name painted on the aircraft after the mission is a pun on "boxcar" after the name of its aircraft commander, Captain Frederick C. Bock.
Bockscar was flown on August 9, 1945, by the crew of another B-29, The Great Artiste, and piloted by Major Charles W. Sweeney, commander of the 393d BS. The plane was co-piloted by 1st Lt. Charles Donald Albury, the normal aircraft commander of Crew C-15.The Great Artiste was designated as the observation, instrumentation support plane for the second mission, and another B-29, The Big Stink, flown by Group Operations Officer Major James I. Hopkins, Jr., as the photographic aircraft. The mission had as its primary target the city of Kokura, Japan, and as its only secondary, Nagasaki.