A gold color metal and enamel device 1 1/8 inches (2.86cm) in height overall consisting of a gold inverted triangle with its lower portion on a light blue enamel demi-segment of a disc and its base point enarched, bearing a light blue enamel winged wheel, wings displayed and the wheel surmounted by a gold hexagon, angle up, all above a red enamel scroll lined gold, convoluting to the sides of the triangle, inscribed "OPTIMUM SERVICE" in gold letters.
Crimson and light blue are the colors used for Maintenance. The triangle and winged wheel are from the arms of the City of St. Paul, the unit's home site and the blue of the demi-segment relates to water and alludes to "the land of 10,000 lakes," one of the designations of Minnesota. The scroll and its convolutions represent a support, and the wheel denotes mobile maintenance; the wings, aircraft maintenance, and the hexagon relate to both the tool and the chemical decontamination aspects of the organization's mission.
The distinctive unit insignia was approved on 22 Apr 1969.