Military justice is the administration of the Uniform Code of Military Justice. The purpose of military justice, as a part of military law, is "to promote justice, to assist in maintaining good order and discipline in the armed forces, to promote efficiency and effectiveness in the military establishment, and thereby to strengthen the national security of the United States" (Manual for Courts-Martial). The Judge Advocate General (TJAG) is responsible for the overall supervision and administration of military justice within the Army. Commanders oversee the administration of military justice in their units and communicate directly with their staff judge advocates (SJAs) about military justice matters. Three organizational components of military justice exist within the Judge Advocate General's Corps (JAGC): the SJA; the Chief, United States Army Trial Defense Service (USATDS); and the Chief, U.S. Army Trial Judiciary.