Gules, two fleurs-de-lis in pale Or, on two flaunches of the like a castle and a cactus of the field.
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.
The shield is red for Artillery. The Spanish castle taken from the Spanish Campaign Medal represents service in Puerto Rico during the Spanish-American War. The cactus and fleurs-de-lis represent service on the Mexican Border and in France, respectively. The flaunches divide the shield in three parts representing the important periods of the organization's history.
The crest is that of the Missouri Army National Guard.
The coat of arms was originally approved for the 128th Field Artillery Regiment on 24 September 1929. It was amended to correct the blazon of the crest on 7 November 1929. It was redesignated for the 128th Armored Field Artillery Battalion on 16 October 1942. The insignia was redesignated for the 128th Artillery Regiment on 26 October 1961. It was redesignated for the 128th Field Artillery Regiment on 14 July 1972.