A shield-shaped device with horizontal scroll attached above the shield, all edged with a 1/8 inch (.32 cm) yellow border, the overall dimensions 3 1/2 inches (8.89 cm) in height and 2 3/4 inches (6.99 cm) in width, the shield green bearing a yellow demi-sun radiant, issuing from base, surmounted by a red sword in the vertical center, with blade up. On the green horizontal scroll the inscription "JEFFERSON" in yellow letters 5/16 inch (.79 cm) in height.
Green and yellow are the colors of Jefferson High School. The demi-sun radiant, suggested by the sun on the State flag of California, alludes to the geographic location of the school. It further represents the striving for excellence in academic, physical endeavors and in military science. The sword is indicative of the military and also alludes to leadership. The red color refers to courage.
The shoulder sleeve insignia was approved 2 July 1980.