(2/1) is an Infantry battalion in the United States Marine Corps based out of Camp Pendleton, California consisting of approximately 1000 Marines and Sailors. They fall under the 1st Marine Regiment and the 1st Marine Division .
- Activated August 1 1922 at Santo Domingo, Dominican Republic , as the 2d Battalion, 1st Regiment and assigned to the 2d Brigade.
- Participated in the occupation of the Dominican Republic, Deactivated 20 July 1924
- Reactivated March 1 1941 at Guantanamo Bay , Cuba , as the 2d Battalion, 1st Marines and assigned to the 1st Marine Division , Fleet Marine Force
- Deployed during April 1941 to Marine Corps Recruit Depot Parris Island , South Carolina
- Deactivated June 14 1941
- Reactivated February 11 1942 at New River , North Carolina , and assigned to the 1st Marine Division, Fleet Marine Force
- Deployed during July 1942 to Wellington, New Zealand
- Participated in the following World War II campaigns:
- --- Guadalcanal
- --- Peleliu
- --- New Britain
- --- Okinawa
- Redeployed during September 1945 to Tiensin , China
- Participated in the occupation of North China, September 1945-October 1947
- Deployed during November 1965 to the Republic Of Vietnam , and assigned to the 3rd Marine Division , Fleet Marine Force
- Participated in the War in Vietnam, November 1965-May 1971,
- --- Hue/Phu Bai
- --- Da Nang
- --- Quang Tri
- --- Thua Thien
- --- Quang Nam
- Detached during April 1971 from the 1st Marine Division, and reassigned to the 3d Marine Amphibious Brigade, Fleet Marine Force
- Relocated during June 1971 to Camp Pendleton, CA, and reassigned to the 1st Marine Division, Fleet Marine Force
Deployed to Fallujah , Iraq in March of 2004 and took part in Operation Vigilant Resolve . Battalion returned to Camp Pendleton in September of 2004.
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