Loading "Little Boy" bomb into B-29 bomber '"Enola Gay". 5th August 1945. Little Boy爓as the燾odename爁or an uranium爂un-type燼tomic bomb dropped on the Japanese city of燞iroshima爋n 6 August 1945 by the燘oeing B-29 Superfortress燛nola Gay; piloted by燙olonel燩aul W. Tibbets; Jr.; commander of the?09th Composite Group爋f the燯nited States Army Air Forces. It was the first atomic bomb to be used in爓arfare. TheHiroshima bombing爓as the second artificial爊uclear explosion爄n history; after the燭rinity test; and the first爑ranium-based detonation. It exploded with an energy of approximately 15 kilotons of TNT (63燭J).燭inian; Mariana Islands in the western燦orth Pacific Ocean.