Naval Base Melbourne was a United States Navy base at Melbourne, Australia during World War II. Naval Base Melbourne became the South West Pacific Area Command Headquarters after the 1941 invasion of the Philippines. General Douglas MacArthur, after escaping the Philippines, set up his Headquarters after his arrival on March 21, 1942. MacArthur was appointed Supreme Commander of all Allied Forces in the South West Pacific Area. The US Navy also set up a Headquarters a Melbourne, Allied Naval Forces Southwest Pacific Area under Commander Vice Admiral Herbert F. Leary. MacArthur and Leary used the empty Trustees Executive building at 401 Collins Street, Melbourne for headquarters. The Port of Melbourne had good fleet anchorage and docks. A new naval base was built at Brisbane, Australia, Nav