300 Wing with the role of providing air transport for the British Pacific Fleet (BPF), and was redesignated as a group in April 1945.

It transported BPF supplies and personnel around Australia and to the fleet's forward bases in the Philippines and Manus Island.

During early stages of the planning to deploy the British Pacific Fleet, it was decided that it needed to be supported by a dedicated force of transport aircraft.

[4][6] During early 1945 the wing established a regular service from Sydney to the BPF's forward base at Manus Island off the north coast of New Guinea; by March these flights operated daily.

[3][4] Due to frequently adverse weather and under-developed airfields, the wing's aircrew found flights between Australia and the Pacific to be challenging.

[9][10] By August 1945 the group was conducting an efficient air transport service, which included evacuating wounded personnel.

300 Group extended its regular route from Sydney to the Philippines to Hong Kong, and was reinforced by a third flying squadron.

The group subsequently opened routes to Singapore as well as Balikpapan and Labuan in Borneo, and Saigon in French Indochina.

238 Squadron's aircraft were reported to have flown a total of 2.3 million miles and transported thousands of service personnel monthly without suffering any serious accidents.