A shield shape embroidered item blazoned as follows:  Tenn, a diminutive pall reversed Sable between the cyphers T, M and I of the second, all within a diminutive border of the last.

 Orange and black are the school colors.  The cyphers are the schools monogram.

The shoulder sleeve insignia was originally approved 2 June 1997, it is currently being amended to update the manufacturing drawings on 13 January 2017. (TIOH Drawing Number a-10J-552)

A Gold color metal and epoxied shield device 1 1/8 inches (2.86 cm) overall, consisting of a shield blazoned:    Or, an escutcheon  blazoned:  Tenn a diminutive pall reversed of the first between the cyphers T, M, and I Sable, all within a diminutive border of the first; perched, above the shield an eagle, wings inverted of the first.  A tripartite scroll Or, surmounting the base of the shield inscribed TEXAS-MILITARY INSTITUTE and below the shield, a scroll inscribed SAN ANTONIO all Or, all surmounting a rifle, muzzle upwards and sword point downwards, in saltire.