A maroon keystone shaped embroidered device, 3 1/2 inches (8.89 cm) in height and 3 1/2 inches (8.89 cm) in width, charged with a cannon and a stack of cannon balls proper, all within a 1/8 inch (.32 cm) maroon border. Above the cannon, the inscription "GETTYSBURG" in white letters 5/16 inch (0.79 cm) in height. Below the cannon, the inscription "HIGH SCHOOL" in white letters 5/16 inch in height.
Maroon and white are the school's colors. The cannon and shot pile are representative of the Gettysburg battlefield and the historical significance to the area.
The shoulder sleeve insignia was approved on 12 January 2006.