Or, a Kentucky Cardinal (cardinalis cardinalis) Proper perched on a twig Vert; on a chief Azure four mullets of the field.
That for the regiments and separate battalions of the Kentucky National Guard; On a wreath of the colors (Or and Azure) within a garland of trumpet vine clasped hands clothed at the wrists, Proper.
ARMA PARATO FERO (I Carry Arms In Readiness).
The four mullets represent the four wars, Mexican, Civil, Spanish and World War I, in which the regiment participated; the chief Azure is symbolic of its history as an Infantry organization, and the Kentucky Cardinal is emblematic of the State of Kentucky and of the regiment's history as an Artillery unit.
The coat of arms was originally approved on originally approved for the 138th Field Artillery Regiment on 4 Aug 1934; redesignated for the 138th Field Artillery Battalion on 28 Dec 1942; redesignated for the 138th Artillery on 4 Oct 1960; redesignated for the 138th Field Artillery on 9 Aug 1970, and amended the correct the crest on 2 Nov 1999.