On a blue disc 2 1/2 inches (6.35 cm) in diameter overall, within a 1/8 inch (.32 cm) blue border, a stylized head of a bulldog affronté yellow, detailed blue, between two arced inscriptions "DECATUR" above and "BULLDOGS" below in yellow letters 5/16 inch (.79 cm) in height.
The shoulder sleeve insignia originally authorized 5 November 1980, was amended 29 March 1991, to add subdued colors and metric measurements. (TIOH Drawing Number A-10J-199)