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.
For Enlisted personnel, the insignia is 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.
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“Motivate And Challenge,” motto of the 644th Personnel Services Battalion found on its Distinctive Unit Insignia, reflects a key component of its missions, namely the provision of direct military personnel support to strength managers and commanders.
Inactivated since September 2009, the 644th Personnel Services Battalion as originally organized and Federally recognized at Springfield in the Illinois Army National Guard on 1 October 1994. Its two subordinate units, the 623rd and 633rd Personnel Detachments, were stationed at Springfield and Crestwood. The Battalion was ordered into active Federal service on 15 March 2003 at Springfield and was released from active Federal service two months later, reverting back to state control on 21 May 2003.
On 1 September 2009, the Battalion was reorganized and redesignated as the 633rd Personnel Detachment, and a year later the new unit was consolidated with the 623rd Personnel Detachment, with the consolidated unit retaining the designation of 633rd Personnel Detachment.