Video: 'The World At War 1973(World War II Documentary)Episode 24-The Bomb(February–September 1945)' (Apr. 24, 1945, at 8:55)

(Tuesday, April 24, 1945; during World War II) — U.S. Secretary of War Henry Simson wrote a memo today to President Harry Truman about the urgent need to discuss a “highly secret matter,” the atomic bomb.