Hiroshima and Nagasaki were not military targets, unless you define every urban center a military target, by virtue of its productive capacity. Once you do that

Hiroshima and Nagasaki were not military targets, unless you define every urban center a military target, by virtue of its productive capacity. Once you do that, the entire idea of separating civilian and military targets becomes an absurdity, and you might as well admit that you consider "enemy" civilians to be fair targets. Historically, the major reason why the US targeted Hiroshima and Nagasaki was that the US military wanted to test its two bomb designs on large, pristine urban centers. Attacking pristine targets made measuring the effects of the bombs easier. If Hiroshima and Nagasaki had been significant military targets, they likely would have been bombed much earlier. In a perverse way, they were chosen because they weren't military targets.