Jim Costello, wearing the white baseball cap that long ago became one of his trademarks, presided over these exhausting practice sessions, starting with a refresher course in the basics of marching; then breaking down and fine-tuning every aspect of the show until it met with his full approval as well as that of the other instructors. By the end of those sessions, Costello usually had lost his voice completely, but those weekend mini-camps got the Caballeros into midseason form compared to the competition.