<strong>August 6, 1945: </strong>A mushroom cloud billows about one hour after a nuclear bomb was detonated above Hiroshima, Japan, on August 6, 1945.
August 6, 1945: A mushroom cloud billows about one hour after a nuclear bomb was detonated above Hiroshima, Japan, on August 6, 1945.
U.S. Army/Hiroshima Peace Memorial Museum/AP
<strong>Enola Gay: </strong>The B-29 bomber Enola Gay as it is maneuvered over the bomb pit on North Field, Tinian, to load the atomic bomb in August 1945.
Enola Gay: The B-29 bomber Enola Gay as it is maneuvered over the bomb pit on North Field, Tinian, to load the atomic bomb in August 1945.
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<strong>Little Boy: </strong>The atomic bomb, codenamed 'Little Boy,' is hoisted into the bomb bay of the Enola Gay on North Field, Tinian.
Little Boy: The atomic bomb, codenamed 'Little Boy,' is hoisted into the bomb bay of the Enola Gay on North Field, Tinian.
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<strong>Moments before takeoff: </strong>Col. Paul Tibbetts waves from the pilot's seat of Enola Gay moments before takeoff on the August, 6, 1945, mission to drop an atomic bomb on Hiroshima, Japan.
Moments before takeoff: Col. Paul Tibbetts waves from the pilot's seat of Enola Gay moments before takeoff on the August, 6, 1945, mission to drop an atomic bomb on Hiroshima, Japan.
Richard Cannon/U.S. Air Force/The LIFE Picture Collection/Getty Images
<strong>Hiroshima:</strong> The aftermath of the atom bomb dropped on Hiroshima, Japan, by the Americans at the end of World War II. The occupants of the burned-out bus were all killed.
Hiroshima: The aftermath of the atom bomb dropped on Hiroshima, Japan, by the Americans at the end of World War II. The occupants of the burned-out bus were all killed.
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<strong>Ground zero:</strong> Devastation at Hiroshima after the atomic bomb was dropped. The building on the right was preserved and today known as the Hiroshima Peace Memorial.
Ground zero: Devastation at Hiroshima after the atomic bomb was dropped. The building on the right was preserved and today known as the Hiroshima Peace Memorial.
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<strong>Aerial view: </strong>A panoramic aerial view of the incinerated city of Hiroshima three weeks after the atomic bomb was dropped, killing 70,000 people.
Aerial view: A panoramic aerial view of the incinerated city of Hiroshima three weeks after the atomic bomb was dropped, killing 70,000 people.
George Silk/The LIFE Picture Collection/Getty Images
<strong>Post mission: </strong>The ground and flight crew of the B-29 bomber Enola Gay at Tinian in the Mariana Islands after the atomic bombing mission on Hiroshima.
Post mission: The ground and flight crew of the B-29 bomber Enola Gay at Tinian in the Mariana Islands after the atomic bombing mission on Hiroshima.
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<strong>Army Day Parade: </strong>Crew members of the Enola Gay, the American B-29 bomber which dropped the atomic bomb on Hiroshima -- including (left to right) co-pilot Capt. Robert A. Lewis, commander and pilot Col. Paul W. Tibbets Jr., tailgunner Staff Sgt. George Caron and flight engineer Staff Sgt. Wyatt Duzenbury -- proudly parade through New York on a Jeep in the first Army Day Parade since the end of the World War II on April 12, 1946.
Army Day Parade: Crew members of the Enola Gay, the American B-29 bomber which dropped the atomic bomb on Hiroshima -- including (left to right) co-pilot Capt. Robert A. Lewis, commander and pilot Col. Paul W. Tibbets Jr., tailgunner Staff Sgt. George Caron and flight engineer Staff Sgt. Wyatt Duzenbury -- proudly parade through New York on a Jeep in the first Army Day Parade since the end of the World War II on April 12, 1946.
Keystone/Getty Images