Air Force 2nd Lt. Chad Hall took a trip from Hill Air Force Base to the University of Utah on Monday, where along with current and former Utah football players, he auditioned in front of NFL scouts at the university’s Pro Day combine. It was a day for which the 2008 U.S. Air Force Academy graduate had been preparing for two years, sometimes working out after 12-hour days and often making the 40-minute drive to the university five or six times a week during the winter months in order to use indoor facilities there. “It was work and then train…