XXI Bomber Command
The first host unit at North Field was the 314th Bombardment Wing, XXI Bomber Command, Twentieth Air Force. The 314th arrived in Guam on 16 January 1945 from Peterson Field, Colorado. The 314th controlled four operational B-29 bomb groups, the 19th, (Square M), 29th (Square O), 39th (Square P), and 330th (Square K).