A gold color metal and enamel device 1 3/16 inches (3.02 cm) in height overall consisting of a white five-pointed star on a gold background and superimposed upon the star's vertical point the head of a blue demi-arrow, its shaft bisecting the star and surmounted by two red bayonets in saltire, their points up and centerlines coincident with the lower edges of the four lower points of the star; and standing upon the horizontal points of the star with its body passing behind the arrowhead a gold lion passant with red tongue; the device enclosed at either side by a gold lined blue scroll folded three times at either side and crossing at bottom with a concave arc bearing the words "TOUGH OMBRES" in gold letters.
The elements of the design reflect the history of the 90th Division: The unit's World War I service in France is represented by the vertical arrow shaft, while the head of the arrow and the gold lion behind it (derived from the coat of arms of Normandy, France) signify participation in the amphibious assault at Normandy during World War II. The white star denotes the Texas origin of the unit; the five points further represent the campaign credits for World War II service in Europe. Awards of the French Croix de Guerre and the Meritorious Unit Commendation are represented by the crossed bayonets.
The distinctive unit insignia was originally authorized for the 90th U.S. Army Reserve Command on 19 October 1979. It was reassigned and authorized for the U.S. Army 90th Regional Support Command effective 16 April 1996. The insignia was redesignated effective 16 July 2003, for the U.S. Army 90th Regional Readiness Command. It was redesignated effective 17 September 2008, for the 90th Sustainment Brigade. It was amended to correct the effective date of the redesignation of the insignia for the 90th Sustainment Brigade to 16 September 2008.