Judge advocates (JAs) in the Marine Corps work under the supervision of the SJA to the CMC to advise Marine commanders regarding legal issues including the laws of war, and handling of criminal cases under the Uniform Code of Military Justice (UCMJ).
The officer is instructed in the fundamental principles of military justice, civil and administrative law, and legal assistance, with practical application of those principles, in order to assist in the attainment of good order and discipline and a high standard of legal practice and administration.
Judge Advocates either conduct or supervise investigations into claims for and against the United States and other matters required by regulations.
Majors and lieutenant colonels may perform duties as a labor, procurement, or environmental law specialist at various area counsel offices.
Judge advocates have the opportunity to pursue advanced study in disciplines relevant to the mission of the Marine Corps.
This article incorporates public domain material from Military Occupation Specialties Manual (PDF).