The 51st Infantry Regiment was constituted 15 May 1917 at Chickamauga Park, Georgia, and assigned on 16 November 1917 to the 6th Division.

[1] The 51st Infantry arrived at the port of New York on 12 June 1919 on the troopship USS Leviathan and was transferred to Camp Merritt, New Jersey, where emergency period personnel were discharged from the service.

It was transferred on 19 June 1919 to Camp Grant, Illinois, where it was inactivated on 22 September 1921 and allotted to the Sixth Corps Area; the 53rd Infantry Regiment was previously designated as "Active Associate" on 27 July 1921, and would provide the personnel to reactivate the 51st Infantry in the event of war.

The 51st Infantry, less the 2nd and 3rd Battalions, was then affiliated with the Reserve Officers' Training Corps (ROTC) program at the University of Wisconsin, in Madison, Wisconsin, and was organized on 15 April 1929 as an RAI unit with Regular Army personnel assigned to the ROTC detachment and Reserve officers commissioned from the program.

It was redesignated again on 11 August 1967, this time as Company F, 51st Infantry and activated on 25 September 1967 in Vietnam with the reflagging of the 196th Long Range Reconnaissance Patrol Detachment, Americal Division,[5] The lineage of F-51st was inactivated on 26 December 1968 in Vietnam when the unit was reflagged as Company G, 75th Infantry (separate lineage and honors).

The colors were inactivated on 15 March 2009 at Fort Bragg when the company was reflagged as Troop C (LRS), 1st Squadron, 38th Cavalry Regiment, 525th Battlefield Surveillance Brigade.

On 16 January 2011, the company was assigned to the 1st Brigade Combat Team, 1st Armored Division, and activated at Fort Bliss.

HHC and Combat Support Company (CSC) assets and personnel were reassigned, and remaining equipment turned in or laterally transferred.

The regiment's crest shows a wreath of the colors (Or and Azure) a ragged tree trunk eradicated Proper.

A gold metal and enamel device 1+5⁄32 inches (2.9 cm) in height overall consisting of a shield blazoned: Azure, a bend Or.

Attached below the shield a blue motto scroll inscribed "I SERVE" in gold letters.