第21爆撃集団
A month later, on 12 April, the 314th Bombardment Wing's remaining two groups, the 39th and 330th, joined in the attack on the Hodagaya Chemical Works in Koriyama. With the addition of the 39th and 330th, the XXI Bomber Command now had three wings, twelve groups, thirty-six squadrons of 15 B-29s each at their disposal. In May, the 58th Bombardment Wing completed its move from India to Tinian, adding four more groups to the XXI Bomber Command.