Up to 1941, Archerfield was being upgraded as a military base for the RAAF pending completion of RAAF Base Amberley. In 1940 a new administration block with control tower on top was built and the RAAF built hangars and huts along the southern boundary of the field.
The attack on the US base in Pearl Harbor coincided with another on US bases in the Philippines. The loss of these bases made Australia, especially the north of the country, a valuable staging area for the war against the Japanese. In the following months, military aircraft of several countries competed for space with the civil airliners still operating.
In February 1945, the Royal Navy moved its Transportable Aircraft Maintenance Yard No.1, known as TAMY 1, to Archerfield. The Royal Navy base was known as HMS Nabsford and a plaque commemorating it and the British personnel who served in the Pacific theatre can be viewed in the old administration building along with plaques from the RAAF and the US 5th Air Force.