Including extensive information only found in scattered sources or official documents and archives, this book provides detailed coverage of all organizational aspects of the Marine Corps units in World War II's Pacific Theater. It gives in-depth background information on the units' functions, evolution, designation practices, tactical organization of combat units, and extensive statistical and technical data including 21 maps. It covers atypical subjects such as Marines in China, and female and African American marines. Extensive additional data on weapons, U.S. Navy and Army backgrounds, Japanese Army and Navy backgrounds, code names, and comparative ranks of U.S. forces appear in the appendices. The book is a valuable one-stop resource for researchers, historians, military history enthusiasts, and war gamers. As a complete reference source on the Marine Corps, the book provides an evolutionary study of the Marine Corps' wartime expansion and organization. It closely examines the prewar and wartime growth of the Marine Corps as well as its postwar reduction while providing complete background information on all ground and air units in the Pacific and their evolution. Information on each Marine Corps unit includes: dates in combat, location and code name of landing beaches, time of landing, island operation code names, date the island was declared secure, task organization for combat order of battle of the opposing Japanese units and their casualties, attached U.S. Army and U.S. Navy units, and much more. The book is the definitive source of organizational information.