Army - Jag Corps Crest - Pen is Mighter Trucker Hat

The Judge Advocate General's Corps (JAG or JAG Corps) is the military justice branch or speciality of the United States Air Force, Army, Coast Guard, Marine Corps, and Navy. Officers serving in the JAG Corps are typically called judge advocates. Judge advocates are responsible for administrative law, government contracting, civilian and military personnel law, the law of war and international relations, environmental law, etc. They also serve as prosecutors for the military when conducting courts-martial.