Description
On 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 (.32 cm) green border.

Symbolism
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."

Background
The shoulder sleeve insignia was originally approved for the 78th Division on 27 May 1922. It was retained for the 78th Division (Training) on 11 September 1959. The insignia was redesignated effective 1 October 1993, for the 78th Division (Exercise) with the description revised. It was redesignated effective 17 October 1999, for the 78th Division (Training Support). It was redesignated effective 1 October 2009, for the 78th Training Brigade. The insignia was redesignated effective 18 September 2010, for the 78th Training Division. (TIOH Drawing Number A-1-125)