ShieldPer fess abased Argent and Azure, in chief a thistle Proper.
CrestThat for the regiments and separate battalions of the Army Reserve: On a wreath of the colors 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.
MottoMARCHONS (March On).
ShieldThe shield is white and blue, the Infantry colors. The blue in base also refers to the organization's original allocation to Michigan with headquarters in Lansing in the southern part of the states, blue being the color of the state flag. The "per fess" division of the shield and the thistle are from the arms of Nancy, the nearest arms-bearing town to Maron, where the 338th Infantry was stationed during World War I.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was originally approved for the 338th Infantry Regiment on 27 March 1928. It was redesignated for the 338th Regiment on 5 August 1960. The insignia was amended to correct the blazon of the shield and revise the symbolism on 3 April 1970.