Garrison went on to show this tenacity and exemplary leadership qualities as the youngest U.S. Army officer ever to hold the ranks of colonel, brigadier general and major general. He returned to Edinburg April 9 to speak to the current cadets at The University of Texas-Pan American and The University of Texas at Brownsville/Texas Southmost College Reserve Officers’ Training Corps (ROTC) during their annual “dining-in” event held at the Museum of South Texas History.