ShieldAzure, in chief a battering-ram Or.
CrestThat for the regiments and separate battalions of the Army Reserve: On a wreath of the colors Or and Azure 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 blue for Infantry. The battering-ram represents the power of the tank as a break-through weapon.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was originally approved for the 423d Infantry Regiment on 18 June 1935. It was redesignated for the 423d Regiment on 1 June 1961.