Twentieth Air Force

Twentieth Air Force is identified in the account of the atomic bombings as the command of the responsible Pacific commander. Its role is presented through the chain of authority for the bomb operation: a military directive governed the delivery of additional bombs, while the decisions’ human and political consequences remained a matter of presidential responsibility.

Command role in the bombing directive

On July 25, a military directive for the first atomic bomb was sent by a deputy to the commander responsible for the operation in the Pacific, identified as the head of Twentieth Air Force. The directive’s second paragraph provided that additional bombs would be delivered to the designated targets as soon as the project staff made them ready. It thus established a standing operational instruction for further use, rather than requiring a new high-level meeting for each bomb.

The second bomb

No high-level meeting about the second bomb took place, and Harry S. Truman made no additional decision before it was used. When the plutonium bomb nicknamed Fat Man was ready, it was delivered from Tinian two days ahead of schedule because of weather conditions. The account places Twentieth Air Force at the command level of this operational chain, while describing the standing directive—not a separate presidential order—as the authority under which the second bomb proceeded.

Operational authority and presidential responsibility

The command arrangement sits alongside the account’s emphasis on civilian control of wartime decisions. Truman’s advisers treated the atomic bomb’s use as a question carrying exceptional responsibility: the committee’s role was advisory, and the responsibility for a recommendation rested with the president. Truman later recalled that military leaders had stressed the projected cost in American casualties of an invasion of Japan, while also saying that he disliked the weapon. The distinction in the narrative is consequential: Twentieth Air Force is named in connection with operational command, but the judgment about whether to continue using the bomb is framed as a responsibility that could not be reduced to the execution of military instructions.