Cliff Grassmick / Staff Photographer)
After a rough season in 2015, Arizona head football coach Rich Rodriguez made the decision to revamp his defensive coaching staff.
That meant firing two assistants that had been with him a long time — defensive coordinator Jeff Casteel and defensive line coach Bill Kirelawich.
Rodriguez said dismissing those coaches was "the most difficult thing I've done in my career."
In the world of coaching, however, what's good for the team trumps friendships, and head coaches often have to make the difficult determination that a change is necessary.