I MET LT. COL. PEDRO PARRA—or Pete, as he introduced himself to me—only once. He attended Canadian’s August 2010 All-School Reunion, and I was there to report the event. In the brief conversation that followed our handshake, in the middle of that crowded school gymnasium, Pete Parra made a lasting impression on me. I learned that he had grown up in Canadian, had played on the Wildcat football…