The Chairman of the Joint Chiefs of Staff established the following goals for 1942–1943: that Guadalcanal would be taken, in conjunction with an Allied offensive in New Guinea under Douglas MacArthur, to capture the Admiralty Islands and the Bismarck Archipelago, including the major Japanese base at Rabaul. The directive held that the eventual goal was the American reconquest of the Philippines. The U.S. Joint Chiefs of Staff created the South Pacific theater, with Vice Admiral Robert L. Ghormley taking command on 19 June, to direct the offensive in the Solomons. Admiral Chester Nimitz, based at Pearl Harbor, was designated as overall Allied commander in chief for Pacific forces.