This volume was prepared for the purpose to make available the information on existing facilities at each advance base in the Central Pacific Area in June of 1945. The paragraph outline presents the following facts about the islands described: location; history; mission; command and service control; aviation facilities; harbor facilities; loading and unloading facilities; shops; personnel facilities; medical and sanitation facilities; roads; military personnel; storage facilities; aerological data; training facilities; armament; radar, loran and radio; communications other than radio; and water supply. The Line Islands, Marshall Islands, Gilbert Islands, Western Caroline Islands, Mariana Islands, and Ryukyu are all described.