Charles William Sweeney (December 27, 1919 – July 16, 2004) was an officer in the United States Army Air Forces during World War II and the pilot who flew Bockscar carrying the Fat Man atomic bomb to the Japanese city of Nagasaki on August 9, 1945. Separating from active duty at the end of World War II, he later became an officer in the Massachusetts Air National Guard as the Army Air Forces transitioned to an independent United States Air Force, eventually rising to the rank of major general. Military career 509th Composite Group Sweeney became an instructor in the atomic missions training project, Project Alberta, at Wendover Army Airfield, Utah. Selected to be part of the 509th Composite Group commanded by Colonel Paul Tibbets, he was named commander of the 320th Troop Carrier Squadron on 6 January 1945. Initially his squadron used C-47 Skytrain and C-46 Commando transports on hand to conduct the top secret operations to supply the 509th, but in April 1945 it acquired five C-54 Skymasters, which had the range to deliver personnel and materiel to the western Pacific area. On May 4, 1945, Sweeney became commander of the 393d Bombardment Squadron, Heavy, the combat element of the 509th, in charge of 15 Silverplate B-29s and their flight and ground crews, 535 men in all. In June and July Sweeney moved his unit to North Field on the island of Tinian in the Marianas. In addition to supervising the intensive training of his flight crews during July 1945, Sweeney was slated to command the second atomic bomb mission. He trained with the crew of Captain (Charles D.) Don Albury aboard their B-29 The Great Artiste, and was aircraft commander on the training mission of July 11. He and the crew flew five of the nine rehearsal test drops of inert Little Boy and Fat Man bomb assemblies in preparation for the missions. On 6 August 1945, Sweeney and Albury piloted The Great Artiste as the instrumentation and observation support aircraft for the atomic bomb attack on Hiroshima. Bombing of Nagasaki On 9 August 1945, Major Sweeney commanded Bockscar, which carried the atomic bomb Fat Man from the island of Tinian to Nagasaki. In addition to Bockscar, the mission included two observation and instrumentation support B-29s, The Great Artiste and The Big Stink, which would rendezvous with Bockscar over Yakushima Island. At the mission pre-briefing, the three