第20爆撃集団
In the spring of 1944, with the arrival of command B-29s in the theater, another factor would be added to air force operations. XX Bomber Command of the Twentieth Air Force was tasked with the strategic bombing of Japan under Operation Matterhorn, and reported directly to the JCS in Washington, D.C. However, XX Bomber Command remained totally dependent on Eastern Air Command for supplies, bases, ground staff, and infrastructure support.