FORT HUACHUCA — In January, Sgt. 1st Class Tim Kurczewski saw Tristian J. Slade off, as the 19-year-old headed for basic training. Monday, the former Army recruiter was at Chaffee Parade Field as he and other soldiers and civilians bade farewell to Slade, a private first class. Slade, of Charlotte, N.C., died Friday morning of unknown causes. Not feeling well, he went to a post medical clinic, where he collapsed, was treated by medical personnel and rushed to the Sierra Vista Regional Health Center, where he was pronounced dead on arrival. The cause of his death is under investigation. Kurczewski...