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The 509th Composite Group (509 CG) was a unit of the United States Army Air Forces created during World War II and tasked with the operational deployment of nuclear weapons. It conducted the atomic bombings of Hiroshima and Nagasaki, Japan, in August 1945. The group was activated on 17 December 1944 at Wendover Army Air Field, Utah. It was commanded by Lieutenant Colonel Paul W. Tibbets. Because it contained flying squadrons equipped with Boeing B-29 Superfortress bombers, C-47 Skytrain, and C-54 Skymaster transport aircraft, the group was designated as a "composite", rather than a "bombardment" formation. It operated Silverplate B-29s, which were specially configured to enable them to carry nuclear weapons. The 509th Composite Group began deploying to North Field on Tinian, Northern Mariana Islands, in May 1945. In addition to the two nuclear bombing raids, it carried out 15 practice missions against Japanese-held islands, and 12 combat missions against targets in Japan dropping high-explosive pumpkin bombs. In the postwar era, the 509th Composite Group was one of the original ten bombardment groups assigned to Strategic Air Command on 21 March 1946 and the only one equipped with Silverplate B-29 Superfortress aircraft capable of delivering atomic bombs. It was standardized as a bombardment group and redesignated the 509th Bombardment Group, Very Heavy, on 10 July 1946.

The 68th New York Infantry Regiment served in the Union Army during the American Civil War. Also known as the Cameron Rifles or the Second German Rifle Regiment, the men were mostly German immigrants. Organized in July 1861, three months after the outbreak of war, the 68th saw service in the Eastern and Western theaters. As a part of the Army of the Potomac, it was initially assigned to the defenses of Washington, D.C. Later, the 68th was transferred to the Shenandoah Valley and fought at the Battle of Cross Keys. The men of the 68th were then reassigned to central Virginia and found themselves in the thick of the fighting at Second Bull Run. After returning to the nation's capital, the regiment fought in Chancellorsville and was routed by Confederate forces. At Gettysburg, they saw battle on two of the three days and took heavy losses. The regiment was then transferred to the west and participated in the Chattanooga Campaign. The 68th fought in the battles of Wauhatchie and Missionary Ridge, assisting in the Union victories there. The regiment marched to relieve the siege of Knoxville, and then spent the last year of the war on occupation duty in Tennessee and Georgia, before being disbanded in November 1865.