Originally constituted in Regular Army on 11 January 1812 as the 14th Infantry, the 4th Infantry Regiment first received its current numerical designation as 4th Infantry in 1815 when it was consolidated with four other Infantry Regiments (18th, 20th, 36th, and 38th). It was under this designation that was reorganized as a parent regiment many decades later under the Combat Arms Regimental System (1958); it was withdrawn from that system in 1985 and reorganized as the 4th Infantry Regiment under the U.S. Army Regimental System with the official Special Designation “Warriors.”
The 1st Battalion, 4th Infantry Regiment was most recently activated in 2005 in Germany. It serves as the OPFOR (Opposing Force) units in training exercises held at the Joint Multinational Training Center in Hohenfels, Germany. 2nd Battalion is currently assigned to the 3rd Brigade Combat Team, 10th Mountain Division, having been reflagged from the Division’s 4th Brigade Combat Team in August 2014. The 3rd Battalion was activated for three year but was inactivated in 2012 in Germany.
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The 4th Infantry Regiment Distinctive Unit Insignia, sometimes referred to as a unit crest or DUI, was approved on 14 September 1989 after it had become a part of the U.S. Army Regimental System. Following the Mexican War but before the blue uniform was abolished, scarlet piping was authorized for wear on chevrons and trouser stripes in acknowledgement of the distinguished service that was rendered by some elements of the Regiment during the Mexican War. The use of green was inspired by its predominance on the Regiment’s coat of arms.
Full guidance on wear of the DUI is found in DA Pamphlet 670-1,
Section 21-22, "Distinctive unit insignia" and 21–3(d) and (e),
"Beret" and
"Garrison Cap," respectively.