Cast of ER Cast of ER "ER" is an American drama series that aired on NBC from September 19, 1994 until April 2, 2009. The series featured a large ensemble cast that changed dramatically over its long run. The main cast was augmented by a wealth of recurring characters and award-winning guest stars. The original starring cast consisted of Anthony Edwards as Dr. Mark Greene, George Clooney as Dr. Douglas "Doug" Ross, Sherry Stringfield as Dr. Susan Lewis, Noah Wyle as medical student (later Dr.) John Carter, and Eriq La Salle as Dr. Peter Benton. Julianna Margulies guest starred in the pilot as
Returned to unit person has been extracted to complete an instruction course run by a specialist unit within the armed forces such as a PTI or Range Control course. In the event of the service person wishing to withdraw from the course (e.g. for personal or medical reasons); or if the course supervisors deem that the service person is unfit to complete the course, for either medical or disciplinary reasons, the service person may be returned to their home unit. If a candidate is RTU'd, the supervisor responsible for sending them home will supply a written report to the service person's OC detailing