Gules, a dexter arm embowed in armour, the upper part in fess grasping a Lochaber axe fesswise Or.
On a wreath Or and Gules, in front of a mound Vert a fleur-de-lis Azure within a chain of five broken links forming an oval opened at the top of the first.
ALL FOR ONE.
The shield is red for Artillery. The arm in the striking position signifies the readiness of the organization.
The five broken chain links symbolize the unit's five battle honors. The fleur-de-lis refers to the area of Europe where they fought in World War II. The color green alludes to hope and liberation.
The coat of arms was originally approved for the 40th Field Artillery Regiment on 29 March 1942. It was redesignated for the 509th Armored Field Artillery Battalion on 9 March 1950. It was redesignated for the 40th Artillery Regiment on 20 November 1958. It was amended to add a crest on 10 May 1967. The insignia was redesignated for the 40th Field Artillery Regiment effective 1 September 1971.