25th Marine Regiment ( United States ) The 25th Marine Regiment ( 25th Marines ) is one of three infantry regiments in the 4th Marine Division of the United States Marine Corps . From its headquarters in Fort Devens , Massachusetts , the regiment commands fifteen training centers in nine states throughout the Northeast . These units consist of approximately 3 , 500 reserve and active duty Marines and are located from Maine to Delaware , West Virginia and as far west as Ohio . The 25h Marines is primarily a cold weather regiment and frequently trains in northern Norway . Mission . Prepare for employment as a Regiment tasked to plan and conduct combat operations in order to locate , close with , and destroy the enemy by fire and maneuver , or to repel his assault by close combat . The reserve mission is to provide trained and qualified units and individuals to augment , reinforce , or reconstitute the active component of the Marine Corps in time of war , national emergency , and such other times as the national security may require . Current units . The Regiment comprises three infantry battalion s and a Headquarters Company : History . The 25th Marines was activated on 1 May 1943 , at Marine Corps Base Camp Lejeune , North Carolina and was initially manned by Marines from throughout the Northeast . The regiment was subsequently assigned to the 4th Marine Division for service in World War II . Initially located at Marine Corps Base Camp Pendleton , California , the regiment was ordered to the Pacific Theater in January 1944 and participated in the Battle of Kwajalein , Saipan , Battle of Tinian and the Battle of Iwo Jima . The regiment won two Presidential Unit Citations for its participation in these battles . The 25th Marines returned to Camp Pendleton at the end of the war and on 10 November 1945 the Regiment was deactivated . On 1 July 1962 , 16 ½ years after its colors had been folded following its service in World War II , the 4th Marine Division was reactivated as a Reserve Division . This reactivation included all three Battalions of the 25th Marines . Since then , the reactivated units have served proudly . Reserve Marines of the regiment have served alongside their regular counterparts in training exercises throughout the world . In February 1991 the entire Regiment was fully activated for Operation Desert Storm . Although , only 1st Battalion deployed into Southwest Asia and participated in the 1st Marine Division ' s initial breach of Iraqi defenses , the regimental headquarters , 2nd and 3rd Battalions mobilized in support of other operational requirements . In January 2002 the regimental headquarters Company and 2nd Battalion , 25th Marines deployed to Camp Lejeune , North Carolina in support of Operation Enduring Freedom and Operation Noble Eagle . Subsequently , Headquarters Company and 2nd Battalion , 25th Marines were deactivated in January 2003 . Since 2003 the regiment has routinely deployed infantry battalions , advisor teams , and Military Transition Teams to Iraq , Afghanistan , and the Horn of Africa in support of the Global War on Terror . Concurrently , the regiment actively participates in numerous bilateral and multilateral theater engagement operations throughout the globe .