The division shoulder sleeve insignia of the United States Army's 78th Infantry Division. The official item description is "a red semi-disc 3 inches (7.62cm) in diameter, a white bolt of lightning from sinister chief to dexter base, all within a 1/8 inch (.32cm) green border. The lightning flash on the red background alludes to the combat record of the division likened to a "bolt of lightning" and to its designation as the "Lightning Division."
US Army Institute of Heraldry
1922-05-27
<a rel="nofollow" class="external text" href="http://www.tioh.hqda.pentagon.mil/Div/78th%20Division.htm">The United States Army Institute of Heraldry</a>