The Naval Justice School (NJS) is an educational institution of the United States Navy whose mission is to instruct Navy, Marine Corps, and Coast Guard officers and enlisted personnel in the fundamental principles of military justice, civil and administrative law, and procedure. In addition to being licensed attorneys in any state or territory of the U.S., all attorneys in the Judge Advocate General's Corps must undergo training either in this institution, or in the complementary institutions of the United States Army and the United States Air Force, allowing them to act as trial or defense counsel at military courts-martial.