Distinctive Unit Insignia. Description: A Gold metal and enamel device 1 5/32 inches (2.94 cm) in height overall, consisting of a shield blazoned: Azure, in pale a prickly pear cactus and the entrance to the canal tunnel over the St. Quentin Canal erased Or. Attached below the shield a Blue scroll inscribed "VIRTUS INCENDIT VIRES" in Gold.
             Symbolism: The shield is blue for Infantry. The cactus represents service on the Mexican border as the 3rd Infantry, North Carolina National Guard. The tunnel symbolizes the mouth of the tunnel in the Hindenberg Line at Bellicourt, France, captured by the 120th Infantry on 29 September 1918.
             Background: The distinctive unit insignia was approved on 28 June 1928.

Coat of Arms.
             Blazon:
                     Shield: Azure, in pale a prickly pear cactus and the entrance to the canal tunnel over the St. Quentin Canal erased Or.
                     Crest: That for regiments of the North Carolina Army National Guard: On a wreath of the colors Or and Azure, a hornet's nest hanging from a bough beset with thirteen hornets all Proper.
                     Motto: VIRTUS INCENDIT VIRES (Virtues Kindles Strength).
             Symbolism:
                     Shield: The shield is blue for Infantry. The cactus represents service on the Mexican border as the 3rd Infantry, North Carolina National Guard. The tunnel symbolizes the mouth of the tunnel in the Hindenberg Line at Bellicourt, France, captured by the 120th Infantry on 29 September 1918.
                     Crest: The crest is that of the North Carolina Army National Guard.
                     Background: The coat of arms was approved on 27 June 1928.