There were NO "military ability" in neither cities! The US forced Japanese government to capitulate by exterminating civilians on a mass scale! Same US did in Vietnam, Serbia and Libya! Same it is doing now in Syria, only instead of WMD or carpet bombing of civilians, US uses terrorists and gangs of international rubble...
I dont like to use Wiki anything but I will make an exception in this case. Since its common knowlege to everyone but you.
At the time of its bombing, Hiroshima was a city of both industrial and military significance. A number of military camps were located nearby, including the headquarters of Field Marshal Shunroku Hata's 2nd General Army Headquarters, which commanded the defense of all of southern Japan.[54] His command consisted of some 400,000 men, most of whom were on Kyushu where an Allied invasion was correctly expected.[55] Also present in Hiroshima was the headquarters of the Fifty-Ninth Army, and most of the 224th Division, a recently formed mobile unit.[56] The city's air defenses comprised five batteries of 7-and-8-centimetre (2.8 and 3.1 in) anti-aircraft guns.[57]
Hiroshima was a minor supply and logistics base for the Japanese military. The city was a communications center, a storage point, and an assembly area for troops. It was one of several Japanese cities left deliberately untouched by American bombing, allowing a pristine environment to measure the damage caused by the atomic bomb.[58]
The center of the city contained several reinforced concrete buildings and lighter structures. Outside the center, the area was congested by a dense collection of small wooden workshops set among Japanese houses. A few larger industrial plants lay near the outskirts of the city. The houses were constructed of wood with tile roofs, and many of the industrial buildings were also built around wood frames. The city as a whole was highly susceptible to fire damage.[59]
The population of Hiroshima had reached a peak of over 381,000 earlier in the war, but prior to the atomic bombing the population had steadily decreased because of a systematic evacuation ordered by the Japanese government. At the time of the attack, the population was approximately 340,000350,000.[1]