Originally named "Depot Field", it was renamed in honor of Lieutenant General Millard F. Harmon.

Harmon Field was built by CB 25 as the headquarters for the XXI Bomber Command and later Twentieth Air Force which directed the B-29 Superfortress strategic bombing campaign against the Japanese Home Islands.

It was also the major B-29 aircraft depot and maintenance facility in the Western Pacific during the war, and that mission continued for Far East Air Forces until its closure.

[citation needed] Today, the technical facilities are an industrial area to the northeast of the Antonio B.

[citation needed] This article incorporates public domain material from the Air Force Historical Research Agency