Azure, a sea lion Or grasping in dexter paw a rifle with fixed bayonet Proper.
On a wreath of the colors a polar bear affronté sejant head to sinister, Proper.
PRO PATRIA (For the Country).
The regiment was organized in Manila in 1916 by transfer of men from the 8th, 13th and 15th Infantry. This is indicated by the sea lion from the coat of arms for the Philippines, the 31st did excellent service in Siberia, this is indicated by the polar bear crest. The motto " For the Country" is indicative of the spirit of the regiment in spite of the fact that the regiment as such has never set foot in the United States.
The coat of arms was approved on 29 Oct 1921.