ShieldAzure, the equestrian statue in profile of Louis IX (St. Louis) of France Or, (the statue is in forest Park, St. Louis, by C.H. Niehaus).
CrestThat for the regiments and separate battalions of the Missouri Army National Guard: From a wreath Or and Azure, a grizzly bear rampant Proper.
MottoST. LOUIS' OWN.
ShieldThe shield is blue for Infantry. The statue of Louis IX (St. Louis) alludes to the home area of the organization.
CrestThe crest is that of the Missouri Army National Guard.
The coat of arms was originally approved for the 138th Infantry Regiment on 8 July 1922. It was amended to correct the blazon on 11 October 1923. It was redesignated for 1138th Engineer Battalion on 3 May 1989. The insignia was redesignated effective 2 September 2010, for the 138th Infantry Regiment with the blazon of the crest updated.