by Jim ClaybornThe Air Force Academy said a cadet suddenly died on Monday after he collapsed while walking to class.Cadet 3rd Class Hunter Brown, 21, was walking to class from his dorm when he experienced a "medical emergency," the Air Force Academy said in a statement. Monday was the first day of class following the winter break. First responders performed lifesaving measures, but Brown ultimately passed away. Officials have not yet determined a cause of death. His roomate, and 2 teammates said that Brown had "no prior health issues" of which they were aware.Brown was a sophomore member of the...