Other Memories As I recall this unit was designated the Saigon Resident Agency, 8th MP Gp (CI), Saigon Field Office, 4th Region, USACIDC, or some variation on that theme, including Saigon Field Office. Unit was located at 200 Ngyen Tri Phoung, Cholon and 22 Yen Do, Saigon during my time there.