BOCKS CAR, (occasionally Bock's Car or Bocks Car) is the name of the U.S. Army Air Forces B-29 bomber (Serial Number 44-27297) which dropped the second nuclear weapon ever used in warfare, on Nagasaki, Japan on August 9, 1945. The weapon was known as "Fat Man".

This historic aircraft is sometimes referred to as "Bocks Car" or "Bock's Car". The name painted on the aircraft after the mission (above) has no apostrophe and it is painted in all capital letters.

BOCKS CAR is on display at the National Museum of the United States Air Force at Wright-Patterson Air Force Base near Dayton, Ohio.
 
The Boeing B-29 Superfortress (Boeing Model 341/345) was a four-engine heavy bomber flown by the United States Army Air Force. It was one of the largest aircraft of World War II to see active service. When it entered service, it was one of the most advanced bombers of its time, featuring innovations such as a pressurized cabin, a central fire-control system, and remote-controlled machine gun turrets. It was designed to be a high altitude daytime bomber, but was most used in low-altitude night time incendiary bombing. It was the primary weapons platform used in the United States fire-bombing campaign against Japan in the final months of World War II, and B-29s carried the atomic bombs that destroyed Hiroshima and Nagasaki. Unlike many other bombers, the B-29 remained in service long after World War II ended, a few being employed as flying television transmitters for Stratovision. By the time it was retired in the 1960s, some 3,900 planes had been built.