General of the Army Douglas MacArthur was appointed Supreme Allied Commander, South West Pacific Area (SWPA) on 18 June 1942. However, he preferred to use the title Commander - in - Chief. During the Allied occupation of Japan following the war, MacArthur held the title of Supreme Commander for the Allied Powers (SCAP).
full name of the allied commander of the pacific war
General of the Army Douglas MacArthur was appointed Supreme Allied Commander, South West Pacific Area (SWPA)