A new set of faces will decide how well Air Force football does this fall. The Falcons bring back just one starter on offense and three on defense in a complete roster turnover from last year’s 9-4 team. Of 134 Division I FBS teams, Air Force ranks last in returning production. Head coach Troy Calhoun, entering his 18th year at the helm in Colorado Springs and coming off three straight bowl seasons in which the Falcons racked up 29 total wins, is embracing the challenge. “You look at the gap between the team that’s 133rd (in returning production), and where we are at 134th, it’s a gigantic space,” Calhoun said.