Per fess Gules and Vert, the base seme-de-lis Or, in chief a mullet and in fess issuing from sinister a lightning flash throughout of the third.
That for regiments of the Texas National Guard: From a wreath Or and Gules, a mullet Argent encircled by a garland of live oak and olive Proper.
Yellow is for Armor and green is for Armored units (Tank Battalions) during World War II, both colors indicating the unit's origin. The star on the red field represents the Artillery units of the Texas Army National Guard from which the 636th Tank Destroyer Battalion was formed. The fleurs-de-lis scattered over the lower part of the shield are for the many campaigns in Europe during World War II. The lightning flash is a symbol of force and striking power.
The crest is that of the Texas Army National Guard.
The coat of arms was originally approved for the 136th Tank Battalion, Texas Army National Guard on 30 July 1953. It was redesignated for the 124th Armor, Texas Army National Guard on 9 September 1960. It was rescinded on 4 march 1976. On 3 July 2001, the coat of arms was reinstated and redesignated for the 136th Regiment, Texas Army National Guard.