FM 3-84 governs legal support across the range of military operations and in specific types or aspects of operations.
View FM 3-84 on armypubs.army.mil
FM 3-84 covers the JAG Corps mission, legal services personnel, Army operations, and legal support at various echelons. It describes four institutional legal functions and support to Soldiers and Families, including legal tasks during large-scale combat operations.
The JAG Corps role is to provide principled counsel and premier legal services to the Army across the range of military operations. (paragraph 1-4)
The Office of the Staff Judge Advocate (OSJA) provides legal support to commanders, staffs, Soldiers, and other eligible individuals supported by a given command. (paragraph 3-4)
Army regulations require JALS personnel to comply with military and civilian codes of professional responsibility and ethics that govern licensure and the practice of law. (paragraph 3-2)
Judge advocates and civilian attorneys are prohibited from providing legal support in any way that violates an applicable rule of legal ethics. (paragraph 3-2)
United States Army Trial Defense Service provides legal support to Soldiers regarding judicial and nonjudicial disciplinary matters. It also provides legal support regarding adverse administrative actions. (paragraph 3-5)