Per bend Or and Gules, in chief a prickly pear cactus Vert and in base three fleurs-de-lis in bend of the first.
That 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.
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The colors red and yellow are for Artillery. The prickly pear cactus is symbolic of the organization's Mexican Border service. The three fleurs-de-lis represent the three battle honors (Meuse-Argonne, Alsace and Lorraine) awarded the battalion for service during World War I.
The crest is that of the Missouri Army National Guard.
The coat of arms was originally approved for the 129th Field Artillery Battalion on 28 August 1952. It was redesignated for the 129th Artillery Regiment on 26 October 1961. The insignia was redesignated for the 129th Field Artillery Regiment on 17 July 1972.