ShieldBuff, a bend dancetté Azure fimbriated Or charged with three Lorraine crosses palewise of the last.
CrestThat for the regiments and separate battalions of the Army Reserve: On a wreath of the colors Or and Buff, the Lexington Minute Man Proper. The statue of the Minute Man, Captain John Parker (H.H. Kitson, sculptor), stands on the Common in Lexington, Massachusetts.
ShieldThe shield is buff, the color of the Quartermaster Corps. The bend is taken from the arms of Lorraine and has been made dancetté to allude to the battle line covered by the 315th Supply Train in the theater of operations during World War I, and the Lorraine crosses represent the three engagements of the organization.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was originally approved for the 90th Division Quartermaster Train on 10 December 1931. It was amended to change the blazon of the shield on 31 May 1932. The insignia was approved and reassigned to the 415th Quartermaster Regiment on 3 January 1938. It was redesignated for the 415th Quartermaster Battalion on 25 March 1942. It was redesignated for the 90th Supply and Transport Battalion on 3 December 1964. The insignia was amended to correct the blazon of the shield and crest on 16 December 1964. It was redesignated for the 90th Support Battalion effective 16 September 2010.