Shield
Gules, on a saltire Azure fimbriated Or, between in chief a fleur-de-lis and in base a rattlesnake coiled to strike, two arrows saltirewise of the last.
Crest
That for the regiments and separate battalions of the Pennsylvania Army National Guard: On a wreath of the colors (Or and Gules) a lion rampant guardant Proper, holding in dexter paw a naked scimitar Argent hilted Or and in sinister an escutcheon Argent on a fess Sable three plates.
Motto
EN AVANT (Forward).
Shield
The shield is red for Artillery. The blue saltire indicates service as Infantry in the Civil War; the arrows, Indian War Service; the rattlesnake, Mexican War and Mexican Border service; and the fleur-de-lis , World War I service.
Crest
The crest is that of the Pennsylvania Army National Guard.
The coat of arms was originally approved for the 109th Field Artillery Regiment, Pennsylvania National Guard on 6 November 1929. It was redesignated for the 109th Field Artillery Battalion on 3 September 1942. It was redesignated for the 109th Artillery Regiment, Pennsylvania National Guard on 8 August 1961. The insignia was redesignated for the 109th Field Artillery Regiment, Pennsylvania Army National Guard on 11 July 1972.