Azure, a wolverine guardant rampant Argent armed and langued Gules within a bordure engrailed of the third.
That for the regiments and separate battalions of the U.S. Army Reserve: From a wreath Argent 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.
The shield is taken from the arms of Bourges in the old province of Berry, the nearest arm-bearing city to Humbligny where the organization was stationed during World War I. The shield of both Berry and Bourges were blue with a red engrailed border. The silver wolverine indicates that allocation of the regiment to Michigan.
The crest is that of the U.S. Army Reserve.
The coat of arms was originally approved for the 340th Infantry Regiment, Organized Reserves on 30 March 1928. It was redesignated for the 340th Regiment on 7 December 1959. The coat of arms was amended to update the blazon on 14 September 1999.