ShieldGules, a houn' dawg statant Or, on a chief Vert a pale of the second (Or) charged with an oak tree eradicated Proper.
CrestThat for the regiments and separate battalions of the Missouri Army National Guard: On a wreath of the colors Or and Gules, a grizzly bear standing rampant Proper.
Motto DON'T KICK OUR DOG.
ShieldThe shield is red for Artillery, charged with the indispensable companion of the Regiment, the Regiment having been for years known as "The Houn' Dawg Regiment." The green chief represents the Mexican Border service, the yellow pale the Spanish War service and the oak tree the Argonne Forest, the Meuse-Argonne of World War I.
CrestThe crest is that of the Missouri Army National Guard.
The coat of arms was originally approved for the 203d Coast Artillery Regiment on 13 January 1925. It was redesignated for the 203d Antiaircraft Artillery Automatic Weapons Battalion on 6 October 1950. The insignia was redesignated for the 203d Armor Regiment on 26 October 1961. It was authorized for the 203d Engineer Battalion on 14 January 1969.