Gules, a leopard courant in bend, head to chief Proper, eyed Vert.
That for the regiments and separate battalions of the Indiana Army National Guard: From a wreath Or and Gules, a demi-lion rampant Argent, holding in dexter paw a laurel branch Vert.
SEEK AND DESTROY.
The service of the former organization, then the 138th Armor, is symbolized by the golden leopard springing upon its prey, indicating the unit's ability to move swiftly, silently stalking its prey, then striking at the opportune moment with all the power and force at its command. It is felt that the animal most typical of this attack is the leopard-powerful, silent and swift, who by means of his cunning as well as his great strength has become known as the greatest of all hunters. The eye of the leopard is emerald green, symbolic of the ability to see and hunt in the night.
The crest is that of the Indiana Army National Guard.
The coat of arms was originally approved for the 638th Tank Destroyer Battalion on 11 September 1942. It was redesignated for the 138th Tank Battalion, Indiana National Guard and amended to add the Indiana National Guard crest on 14 December 1951. It was redesignated for the 138th Armor Regiment on 3 June 1960. The insignia was redesignated for the 138th Regiment with the blazon and symbolism revised on 12 June 1997.