A Judge Advocate Colonel heads the Trial Defense Service. The Office of the Chief, TDS, is located in Fort Belvoir in the United States Army Legal Services Agency building. TDS consists of the Chief, TDS, the Deputy Chief, the Operations and Plans Officer, the Chief of the Defense Counsel Assistance Program, the Chief of Complex Litigation, several training attorneys, a Senior Legal Administrator Warrant Officer, a Senior Enlisted Paralegal, administrative staff, and nearly 600 TDS personnel worldwide. Under the Chief of TDS, there are eight Regional Defense Counsel (RDC) responsible for overseeing defense services within a geographic region (see below). Each RDC oversees several Senior Defense Counsel (SDC), who manage field offices with the responsibility of providing defense services for a specific post, command, or area. Regions are also assigned one to two defense investigators. Some field offices oversee geographically separate branch offices.