World The US dropped the first warfare atomic bomb on Hiroshima 75 years ago August 6, 2020USA TODAY, WochitComments Off on The US dropped the first warfare atomic bomb on Hiroshima 75 years ago On August 6, 1945, the U.S. B-29 bomber Enola Gay dropped an atomic bomb on Hiroshima, Japan, marking the first time the bomb was used in warfare.