A Gold color metal and enamel device 1 1/8 inches (2.86 cm) in width overall, consisting of a shield blazoned: Or a rifle bendwise stock to base in saltire with a cutlass point to base above a scroll inscribed "SAN ANTONIO" Gold, surmounted by an escutcheon blazoned: Tenn, a pall diminished reversed Or between the cyphers T, M, I, Sable all within a diminished border of the second, and debruised in base by a triparted scroll inscribed "TEXAS," "MILITARY," "INSTITUTE," Gold.
The device is in the colors of the school and reflects the military drill and education of the cadets.
The shoulder loop insignia was approved 2 June 1997.