The bulk of TDS is made up of U.S. Army Reserve attorneys and paralegals. The reserve component of the Trial Defense Service consists of the 16th Legal Operations Detachment, the 22nd Legal Operations Detachment and the 154th Legal Operations Detachment. The 16th LOD is responsible for reserve TDS services east of the Mississippi and north of the Mason–Dixon line, and in Germany; the 22nd LOD is responsible for reserve TDS services west of the Mississippi River, Alaska, Hawaii and South Korea; and the 154th LOD is responsible for TDS service east of the Mississippi and south of the Mason Dixon line, and in Puerto Rico. The LODs are divided into distinct regions that are spread throughout their areas of responsibility.