The 33rd Brigade Special Troops Battalion is a former unit in the Illinois Army National Guard. It was originally assigned to the 33rd Infantry Division and served with that unit in World War II while it was designated as Special Troops, 33rd Infantry Division. Its components included a HQ Company, a Light Maintenance Company, Quartermaster Company, Signal Company, a Military Police platoon, and band. It earned credit for participation in the New Guinea and Luzon campaigns and earned two Meritorious Unit Commendations and a Philippine Presidential Unit Citation.
When the 33rd Infantry Division was deactivated in 1968, the Battalion was incorporated into the 33rd Infantry Brigade, which later was designated as the 33rd Infantry Brigade Combat Team. On 4 October 2014, the 33rd Brigade Special Troops Battalion was deactivated and its personnel transferred to the 766th Brigade Engineer Battalion.
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Also known as a unit crest or DUI, a 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 (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.
Enlisted personnel wear the insignia centered on a shoulder loop by placing it an equal distance from the outside shoulder seam to the outside edge of the shoulder-loop button. Officers (except Generals) wearing grade insignia on the shoulder loops center the DUI by placing it an equal distance between the inside edge of the grade insignia and the outside edge of the button.
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.