As of 2018, the 23rd Infantry Regiment comprises three Battalions—the 1st, 2nd, and 4th—that are currently assigned to various Brigade Combat Teams. As of Winter 2023, 1st and 4th Battalions (1-23 INF and 4-23 INF) are assigned to the 1st and 2nd Stryker Brigade Combat Teams (SBCTs), respectively, of the 2nd Infantry Division, while the 2nd Battalion (2-23 INF) is assigned to the 1st SBCT, 4th Infantry Division.
The lineage of the 23rd Infantry Regiment, nicknamed the Tomahawk Regiment, extends back to the start of the Civil War, when these Battalions were constituted as Companies A, B, and D in the 1st Battalion, 14th Infantry. All three of the Battalions have campaign participation credits for almost every conflict since that time, Civil War and Indian Wars up to the War on Terrorism.
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Also known as a unit crest or DUI, the Distinctive Unit Insignia is worn by all Soldiers (except General Officers) in units that have been authorized to be issued the device. It is worn centered on the shoulder loops of the Army Green Service Uniform (AGSU) and the blue Army Service Uniform (ASU, Enlisted only) with the base of the insignia toward the outside shoulder seam. DUIs are not worn on the Dress variations of either uniform, however.
The 23rd Infantry Regiment Distinctive Insignia is essentially the bottom half of the Regiment’s Coat of Arms. Blue and white are the two colors that have been used for Infantry units since Revolutionary War times. A Maltese Cross in the upper left quadrant symbolizes the Regiment’s service in Fifth Corps of the Army of the Potomac during the Civil War; while the Sea-Lion opposite is part of the seal of Manila and represents the unit’s service in the Spanish-American War.
A globe with a ship on each hemisphere is a visual reminder that the 23rd was the first American Regiment ever to circumnavigate the globe. The motto, “We Serve,” is a simple but powerful testimony to the decades of commitment and sacrifice the 23rd has contributed in defense of our nation and the liberties it affords.
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.