After the liberation of most of Australian New Guinea the RAAF and RAN participated in the US-led Western New Guinea campaign, which had the goal of securing bases to be used to mount the liberation of the Philippines. Australian warships and the fighter, bomber and airfield construction squadrons of No. 10 Operational Group RAAF participated in the capture of Hollandia, Biak, Noemfoor and Morotai. After western New Guinea was secured No. 10 Operation Group was renamed the First Tactical Air Force (1TAF) and was used to protect the flank of the Allied advance by attacking Japanese positions in the NEI and performing other garrison tasks. The losses incurred whilst performing these relatively unimportant roles led to a decline in morale, and contributed to the 'Morotai Mutiny' in April 1945.