On a brown horizontal oval a yellow cougar head in trian aspect couped, highlighted white and detailed brown entoured with a white garland between a yellow scroll inscribed "McNAIR" in brown letters above and a yellow scroll inscribed "ACADEMIC" in brown letters below, all within a 1/8 inch (.32 cm) brown border. The overall dimensions are 3 inches (7.62 cm) in height and 2 9/16 inches (6.51 cm) in width.
Gold and brown are the school colors and reflect the cadets' pride and respect for school, community and country. The cougar, the school mascot, symbolizes aggressiveness in attaining education with honors which is represented by the white garland.
The shoulder sleeve insignia was approved 6 October 1998.