which us branch bombed hiroshima?

Which US branch? The executive branch. Which Department? The War Department (later became the department of defense). Which military branch? US Army, Army Air Forces.
 
The Army Air Forces, the aviation division of the US Army. (This was about 2 years before the US Air Force was developed)

(The Army Air Corps is wrong. The AAC ended in 1941, before Pearl Harbor was even bombed.)
 
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