Now worn by personnel serving in the 645th Regional Support Group, the 645th Support Group Distinctive Unit Insignia (AKA "unit crest" or DUI) was approved on 23 November 1999. The black and gold interlocking diamond shapes, called mascles, are symbols of solidarity and cooperation within and between organizations that create the type of confidence necessary to deliver “Unquestionable Support.”
Two swords form a chevron, an historical heraldic symbol for support which reinforces the Group mission while also conveying its readiness. The use of black throughout the insignia denotes strength, scarlet is for courage, and gold is for excellence and high achievement.
Distinctive Unit Insignias are 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.
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Constituted as HQ and HQ Company, 645th Support Group in the Army Reserve on 31 December 1998, today’s 645th Regional Support Group would be ordered into active military service in the War on Terrorism following its HHC’s redesignation as a Headquarters and Headquarters Detachment on 16 September 2006. It has deployed to Afghanistan at least two times in support of Operation Enduring Freedom, with its service as the garrison command for Kandahar Airfield between 14 May 2011 and 5 April 2012 being recognized with a Meritorious Unit Commendation announced in March 2013.
As of Autumn 2023, the 645th Regional Support Group is headquartered in Ann Arbor and controls the 406th Combat Sustainment Support Battalion. It is a subordinate unit of the 103rd Expeditionary Sustainment Command, 79th Theater Sustainment Command, United States Army Reserve.