 The Corps is composed of three Air Force Wings , three Army Brigades , two Navy and Marine Regiments , as well as the Fightin ' Texas Aggie Band , whose members may be affiliated with any military branch . Parson 's Mounted Cavalry is the only mounted ROTC unit in the United States . The Ross Volunteer Company , the oldest student @-@ run organization in the state , is the official honor guard for the Governor of Texas . The Fish Drill Team , a precision , close @-@ order rifle drill team composed entirely of Corps freshmen , represents the school in local and national competitions . They have won the national championship almost every year since their creation in 1946 , and have appeared in several Hollywood productions , with prominent roles in the movies A Few Good Men and Courage Under Fire . 
