As directed, the regiment will prepare infantry battalions for deployment to the Pacific Command (PACOM AOR) in order to support III Marine Expeditionary Force (III MEF) operations and training The 7th Marine Regiment was formed in Philadelphia, Pennsylvania on 14 August 1917.

[2] The regiment was reactivated on 6 September 1933 at Marine Corps Base Quantico, Virginia with two battalions and was again alerted for service in Cuba but did not deploy.

The regiment moved to what is today Marine Corps Base Camp Lejeune, North Carolina.

Colonel Amor L. Sims led the regiment during the whole Guadalcanal campaign and his men annihilated over 6,000 Japanese in 42 separate engagements.

The Seventh Marine Regiment fought in such places as Eastern New Guinea, New Britain, "Bloody Peleliu" and the island fortress of Okinawa.

On 7 October 1950, after 22 days of fighting, 7th Marines, situated north of the Han River was relieved by units of the US & ROK Armies and retired to a staging area near Incheon.

[7] After reembarking on amphibious shipping and sailing to the east coast of the peninsula, the regiment came ashore at Wonsan on 26 Oct.[8] Based on X Corps tasking, 1st Marine Division ordered 7th Marines to advanced north along the Hamhung-Chosin Reservoir road to the northern tip of the reservoir.

[10] Before the regiment began to move north on 1 Nov, it had already begun to receive reports from adjacent ROK AND US Army units that Chinese forces were operating in the area.

Because the nearest US Army unit to the west was nearly 60 miles away, the regiments left flank was exposed during its entire movement north.

Although the MSR was cut for a period of time, the regiment defeated the enemy forces in area with more than 100 Marines wounded, the 7th continued north.

[21] The entire regiment was inside the perimeter of Koto-ri by 1700 on 7 Dec.[22] 7th Marines, with remnants of Regimental Combat Team 31 attached, continued to attack south seizing the approaches to the Funchilin Pass on 8–9 Dec.[23] PVA forces had destroyed the bridge at the Funchilin Pass delaying the retreat until Marine and Army engineers constructed a temporary bridge.

[28] For the remainder of the year and until March 1952 the regiment found itself dug and defending heavily fortified positions in fighting similar to the trench warfare of World War I.

[30]The 7th Marine Regiment finally departed South Korea on 10 March 1955, sailing from Inchon and arriving at MCB Camp Pendleton two weeks later.

[31] In fall of 1962, substantial parts of the regiment embarked for the Caribbean and possible action in Cuba, aimed at forcing the removal of Soviet nuclear missiles pointed at the United States.

As the Cuban Missile Crisis subsided, The Seventh Marines returned to Camp Pendleton, California.

[citation needed] In December 1992, RCT-7 deployed on Operation Restore Hope to relieve famine and return order to Somalia, remaining there for five months.

On 21 March, the regiment crossed the line of departure into Iraq as it moved to seize and cut off Iraqi units around Basrah.