A Gold color metal and enamel device 1 7/32 inches (2.78 cm) in height consisting of a shield blazoned: Azure a fess wavy Gules fimbriated Or, between two fleurs-de-lis in chief and a rampant lion in base of the last, on a wreath Gold and Blue, a sheaf of seventeen arrows Argent, bound by a sprig of buckeye (aesculus glabra) fructed Proper (two leaves bursting burr). Attached below and to the sides of the shield a Blue scroll inscribed "WE'LL DO IT" in Gold letters.
The shield is blue for Infantry divided by a wavy fess of red, bordered by two gold bands, representing the Escaut River in Belgium, which the Regiment, under heavy fire, was the first of the Allied Troops to cross during World War I, costing the lives of many men, but held in the face of concentrated artillery fire and in the face of counter attacks. Two gold fleurs-de-lis, taken from the ancient French Arms denote service in France, the holding of two sectors in that country, the gold lion rampant is taken from the ancient French Arms denote service in France, the holding of two sectors in that country; the gold lion rampant is taken from the arms of Belgium and denotes service in that country in the Ypres-Lys offensive. At the time of the crossing of the Escaut River, the units attempting the act were just a little doubtful as to how a swift river could be crossed without pontoons. Lieutenant Colonel Marlin, then Major Marlin, reminded them of a certain ceremony that was to be performed on reaching the Rhine, and with the catch phrase "We'll Do It," the soldiers fell to work, cut down a tree across the Escaut and crossed, Indian file, over the three.
The distinctive unit insignia was approved on 27 September 1923.