World War II

World War II
In World War II, the Marines played a central role in the Pacific War. The battles of Guadalcanal, Tarawa, Cape Gloucester, Saipan, Peleliu, Iwo Jima, and Okinawa saw fierce fighting between U.S. Marines and the Imperial Japanese Army.

Philip Johnston proposed the use of Navajo as a code language to the Corps. The idea was accepted, and the Navajo code was formally developed and modeled on the Joint Army/Navy Phonetic Alphabet.

During the battle of Iwo Jima, photographer Joe Rosenthal took the famous photograph Raising the Flag on Iwo Jima of five Marines and one Navy Corpsman raising the American flag on Mt. Suribachi. Secretary of the Navy James Forrestal, having come ashore earlier that day, said of the flag raising, "...the raising of that flag on Suribachi means a Marine Corps for the next five hundred years." The acts of the Marines during the war added to their already significant popular reputation. By war's end, the Corps expanded from two brigades to six divisions, five air wings, and supporting troops, totaling about 485,000 Marines. In addition, 20 defense battalions and a parachute battalion were set raised. Nearly 87,000 Marines were casualties during World War II (including nearly 20,000 killed), and 82 were awarded the Medal of Honor.

Despite Secretary Forrestal's prediction, the Corps faced an immediate institutional crisis following the war. Army generals pushing for a strengthened and reorganized defense establishment also attempted to fold the Marine mission and assets into the Navy and Army. Drawing on hastily assembled Congressional support, the Marine Corps rebuffed such efforts to dismantle the Corps, resulting in statutory protection of the Marine Corps in the National Security Act of 1947. Shortly afterward, in 1952 the Douglas-Mansfield Bill afforded the Commandant an equal voice with the Joint Chiefs of Staff on matters relating to the Marines and established the structure of three active divisions and air wings that remain today.