Description
A red diamond (a rhombus) with vertical axis 2 1/2 inches (6.35 cm) and horizontal axis 1 1/2 inches (3.81 cm).

Symbolism
The insignia was adopted by the Division upon its arrival in France. The color red was selected as a compliment to the then Commanding General whose branch of the service was the Artillery. The "ace of diamonds" was selected from the trade name "Diamond dye - it never runs." The red diamond represents a well-known problem in bridge building, it is made up of two adjacent isosceles triangles which made for the greatest strength. The Division's nickname is "Red Diamond." It is reported that the Division was latterly known among the Germans opposed to it as the "Red Tigers" and the "Red Devils."

Background
The shoulder sleeve insignia was originally approved for 5th Division on 20 October 1918. It was amended on 11 October 1922, to correct the wording of the description. On 25 May 1943, the insignia was redesignated for the 5th Infantry Division and amended to include the symbolism of the design. (TIOH Dwg. No. A-1-80)