Atomic bomb

The Sons of the American Revolution raise the flag at the Harry S. Truman Library for the Harry S. Truman Appreciation Society program, which featured Paul W. Tibbets, Jr., the pilot of the airplane that dropped the bomb on Hiroshima. Military men from Whiteman Air Force Base stand at attention. Donor: Ed Ireland. Donor: Ed Ireland.

The Sons of the American Revolution raise the flag at the Harry S. Truman Appreciation Society program, which featured Paul W. Tibbets, Jr., the pilot of the airplane that dropped the bomb on Hiroshima. Military men from Whiteman Air Force Base stand at attention. Donor: Ed Ireland.

Sons of the American Revolution march in a flag parade in the driveway of the Harry S. Truman Library for the Harry S. Truman Appreciation Society program featuring Paul W. Tibbets, Jr., who dropped the atomic bomb on Hiroshima. Donor: Ed Ireland.

Sons of the American Revolution and members of Whiteman Air Force Base raise the flag for the Harry S. Truman Appreciation Society program at the Harry S. Truman Library. Speaker was Paul W. Tibbets, Jr., who dropped the atomic bomb on Hiroshima. Donor: Ed Ireland.

The experimental prototype of an atomic bomb called the Gadget waits at the base of the Trinity test tower near Alamogordo, New Mexico, before it lifted into firing position and successfully tested.

General Leslie R. Groves and Dr. J. Robert Oppenheimer lean over a desk and glance up from a file of paperwork. A wall-sized map showing the Arctic Ocean is behind them.

Three leading physicists (L-R), Ernest O. Lawrence, Enrico Fermi, and Isidor I. Rabi, gather at Los Alamos National Laboratory during their work on the atomic bomb (Manhattan Project).

The first successful test of an atomic bomb, Alamogordo, New Mexico, taken by an engineer who assisted on the test.

Nuclear weapon of the "Little Boy" type, the kind detonated over Hiroshima, Japan, in World War II. The bomb is 28 inches in diameter and 120 inches long. The first nuclear weapon ever detonated, it weighed about 9,000 pounds and had a yield equivalent to approximately 20,000 tons of high explosive.

Area of devastation by the atomic bombing of Hiroshima, Japan.