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| 1942 - 1945 |
Activated 1 April 1942 at Camp Elliott, San Diego, California, as the 2nd Battalion, 9th Marines and assigned to the 2nd Marine Division Reassigned during August 1942 to Amphibious Corps, Pacific Fleet Relocated during September 1942 to Camp Pendleton, California, and reassigned to the Advanced Echelon, 3rd Marine Division Reassigned during November 1942 to the 3rd Marine Division Deployed during January-February 1943 to Auckland, New Zealand Redeployed during June-July 1943 to Guadalcanal Participated in the following World War II Campaigns: Bougainville Northern Solomons Guam Iwo Jima Relocated during November-December to Camp Pendleton, California Deactivated 31 December 1945 |

| 1952 - 1965 |
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Reactivated 9 April 1952 at Camp Pendleton, California, and assigned to the 3rd Marine Division Deployed during August 1953 to Camp Gifu, Japan Redeployed during June 1954 to Camp Sakai, Japan Redeployed during July 1955 to Camp Kawasaki, Okinawa Redeployed during September 1955 to Camp Napunja, Okinawa Redeployed during January 1956 to Camp Sukiran, Okinawa
Redeployed during March-April 1957 to Camp Fuji, Japan Redeployed during October 1957 to Camp Hauge, Okinawa Redeployed during February 1958 to Camp Kinser, Okinawa Participated in the Battalion Transplacement System between the 1st Marine Division and the 3rd Marine Division during June 1959 to December 1960 Deployed at various times between 1960-1965 as the Battalion Landing Team of the Seventh Fleet
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| 1965 -1990 |
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Redeployed during July 1965 to Da Nang, Republic of Vietnam Participated in the war in Vietnam, July 1965 - August 1969 , operating from:
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Da Nang
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Than Cam Son
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Hue/Phu Bai
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Ca Lu
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Dong Ha
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Quang Tri
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Camp Carrol
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Cua Viet
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Cam Lo
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Con Thien
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Vandergift Combat Base
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Redeployed during August 1969 to Camp Schwab, Okinawa, and assigned to the 9th Marine Amphibious Brigade Reassigned during November 1969 to the 3rd Marine Division Deployed at various times between 1969 - 1971 as the Battalion Landing Team of the Seventh Fleet Participated in the Typhoon Relief Operations in the Philippines during October 1970 Elements of the Battalion Participated in the Mayaguez Operation, May 1975 Relocated during October 1978 to Camp Hansen, Okinawa
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| 1991 - 2009 |
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Participated in Operation Fiery Vigil, Philippines, June 1991
Participated in Operation Desert Storm, Persian Gulf, September 1991
Participated in Operation Restore Hope, Somalia, December 1992 - February 1993
Deactivated 9 September 1994
Reactivated 13 July 2007 at Camp Lejeune, North Carolina, and assigned to 6th Marines, 2nd Marine Division
Participated in Operation Iraqi Freedom, Iraq, September 2008-April 2009
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