Gules, five high explosive projectiles palewise in chevron surmounted by three chevronels Or.
On a wreath of the colors Or and Gules a fixed searchlight Sable, glass Or charged with a fleur-de-lis Gules.
UNIDIQUE VENIMUS (We Come From All Parts).
Scarlet and yellow are the colors used for Artillery. The three chevronels from the coat of arms of John Winthrop, the founder of the Boston Colony, alludes to Boston, the area in which the unit was originally constituted and organized in 1918. The five projectiles are symbolic of the unit's five battle honors awarded for service in World War II. They also commemorate the mission of the unit to attack and destroy enemy aircraft.
The fixed searchlight used in seacoast defense refers to the former mission of the Regiment as Coast Artillery. The fleur-de-lis is for service in World War I.
The coat of arms was originally approved for the 71st Artillery Regiment on 21 May 1959. It was redesignated for the 71st Air Defense Artillery Regiment effective 1 September 1971.