History
For more information, see Advanced Base Force.The defense battalions were first conceived from the fixed defense concept during the Marine Corps's, as well the United States Navy's, critical change in their traditional sea service role to a more 'aggressive' amphibious landing force. They conducted "fixed" defense exercises on Culebra Island of Puerto Rico throughout the first half of the 20th century, and other areas around the Caribbean.
The first battalions were created in 1939, when the outbreak of World War II caused concerns that overseas bases might be attacked by the Imperial Japanese Navy. After the attack on Pearl Harbor, where defenders shot down three planes on December 7, 1941, the battalions grew rapidly. On December 8, the Japanese began an assault on Wake Island, and the defenders surrendered after a prolonged battle on December 23.
1942 became a period of defense for the Pacific Theater, and as such, the Marine Defense battalions saw much reinforcement, redeployment, and growth. On June 4, the Marines at Midway Island fended off a Japanese aerial attack, which contributed to the victory of the naval battle hundreds of miles away. On August 7, the 3rd Defense Battalion went ashore with the infantry to Guadalcanal and defended the island (and others in the Solomon Islands) against Japanese counterattacks during the Battle of Guadalcanal.
In the summer of 1943, elements of the 9th, 10th, and 11th Defense Battalions supported the Army's XIV Corps in the central Solomon's campaign. Other battalions helped clear the northern islands, including Bougainville, and by the spring of 1944, they were all taken.
In early 1944, the Marshall Islands became the next target in the Pacific, and the Marine defenders moved in. By summer, they landed in the Mariana Islands, including Saipan, and Guam. During that time, Commandant of the Marine Corps LtGen. Alexander Vandegrift began to scale back on defense battalions. Two were disbanded, and the remaining began to gradually focus on anti-aircraft defense, rather than coastal defense. Only the 6th, the 51st, and the 52nd remained designated as defense battalions, the rest had become anti-aircraft units under Fleet Marine Force, Pacific.
In late 1944, the 2nd, 5th, 8th, and 16th Antiaircraft Artillery (formerly Defense) Battalions formed the 1st Provisional Antiaircraft Artillery Group in preparation to invade the Japanese Home Islands. While they did not participate in the Battle of Iwo Jima, they did land on Okinawa in April 1945. Soon after, the Japanese surrender lead to the disbanding of most of the defense battalions.
Marine defense battalions were seen as an ideal platform for integrating African Americans into units with white leaders, since they trained independently and fought in isolated areas. Those recruits slated for defense battalions were trained at the then-segregated Montford Point (now known as Camp Gilbert H. Johnson, part of the Marine Corps Base Camp Lejeune complex in North Carolina). They would then be assigned to the two black defense battalions, the 51st and 52nd.
Read more about this topic: Marine Defense Battalions
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