Gules on a pale Argent six mullets of the field below a fess archy enhanced in the colors of the rainbow, between in fess a castle and a rattlesnake coiled to strike both Or.
That for the regiments and separate battalions of the Indiana Army National Guard: On a wreath of the colors Argent and Gules, a demi-lion rampant Argent, holding in dexter paw a laurel branch Vert.
FIDE ET VIRTUTE (With Faith And Valour).
The shield is red for Artillery. The castle represents service during the Spanish-American War; the coiled snake, service on the Mexican Border; the six mullets, the six major engagements and the rainbow the division in which the 150 Field Artillery saw service during World War I.
The crest is that of the Indiana Army National Guard.
The coat of arms was originally approved for the 150th Field Artillery Regiment on 23 July 1927. It was redesignated for the 150th Field Artillery Battalion on 19 November 1942. The insignia was redesignated for the 150th Artillery Regiment on 14 June 1960. It was redesignated for the 150th Field Artillery Regiment on 28 August 1972.