ShieldAzure, in bend three axes paleways between six fleurs-de-lis, three similarly arranged enhanced and three debased all Argent.
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.
MottoTHE CITIZEN IN ARMS.
ShieldThe shield is blue for Infantry. The fleurs-de-lis represent the service in France during World War I and the axe is the shoulder sleeve insignia of the 84th Division to which the Regiment was assigned originally. The 3-3-3 arrangement of the charges indicates the numerical designation.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was originally approved for the 333d Infantry Regiment, Organized Reserves on 17 March 1925. It was redesignated for the 333d Regiment on 26 November 1959.