Shield
Per chevron debased Azure and Gules, two chevronels Argent, upper charged with an annulet between a mascle and a cross pate all of the first, the lower charged with a keystone of the second; in chief a fasces Or charged with the letters NG palewise Sable and in base a lion rampant of the fourth.
Crest
That for the regiments and separate battalions of the Pennsylvania Army National Guard: From a wreath Argent and Azure, 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
NON SIBI, SED PATRIAE (Not Self, But Country).
Shield
The shield is blue to indicate that the regiment originally was organized as Infantry; the red indicates the Field Artillery service during World War I. The fasces is taken from the original emblem adopted by the organization when it was started as a company of Infantry in 1840. The three charges on the upper chevron represent the three Corps badges as worn during the Civil War: the annulet, I Corps, 2d Division; the mascle, III Corps, 2d Division; and the cross pate (described during the Civil War as a "Maltese Cross"), V Corps, 3d Division, Army of the Potomac. The upper chevron is representative of the Potomac River, the lower chevron of the Marne. The keystone is the shoulder sleeve insignia of the 28th Division. The rampant lion is for the service of the 108th Field Artillery under the command of the King of Belgium during World War I.
Crest
The crest is that of the Pennsylvania Army National Guard.
The coat of arms was originally approved for the 108th Field Artillery Regiment, Pennsylvania National Guard on 14 October 1926. It was amended to change the blazon by adding "and in base a lion rampant of the tenth" and added to the last paragraph of the description was "The rampant lion was for the service of the 108th Field Artillery under command of the King of Belgium during the World War" on 13 May 1927. It was further amended to change dates given in the description on 13 June 1930. It was redesignated for the 108th Field Artillery Battalion and the history revised on 3 July 1943. It was redesignated for the 108th Artillery Regiment, Pennsylvania National Guard and amended to change "Maltese Cross" in the blazon and description to "Cross Pate" on 25 August 1961. The insignia was redesignated for the 108th Field Artillery Regiment, Pennsylvania Army National Guard on 11 July 1972. The insignia was cancelled on 15 May 1979. It was reinstated effective 1 September 1997, for the 108th Field Artillery Regiment, Pennsylvania Army National Guard with the blazon and symbolism amended.