A Judge Advocate General (often shortened to JAG) within Starfleet is an officer that oversees legal matters concerning Starfleet personnel. Legal counsel within Starfleet report into the senior JAG as part of the department known as the Judge Advocate General's Office (or simply the "Judge Advocate's Office"). The JAG's office operated court martials.

The Judge Advocate General of Starfleet is the flag rank officer who oversees the JAG corps, and is a member of Starfleet Command. Rear admiral Salvatore Barranco was the JAG in the late 2370s (Star Trek: Pendragon)

The Judge Advocate General's Office was responsible for the investigation into the mutiny that occurred aboard the USS Pegasus in 2358. In 2370, Cadet Daniel Bryce interned with the Earth JAG office at the time the Pegasus scandal was uncovered. (TNG: "The Pegasus"; Junction Point)

Timothy Sinclair served two brief stints with the JAG office on Earth in the early 2360s. (Star Trek: Pendragon)

Captain Taldeen was assigned to the Judge Advocate General's office from 2364 through 2366. (Star Trek: Outpost)

During the 2360s, due to Starfleet regulations, JAG members were not allowed to pilot shuttlecraft independently. (TNG comic book: "The Rich and the Dead!")

During the Dominion War, this regulation was repealed and JAG members were even allowed to pilot single-seat fighters in combat. Tortis was one such JAG member that took on additional duties. (Star Trek: False Vacuum)

Vice Admiral Carla Frigg has been the head of JAG since 2370. (Star Trek: Pioneer: "Internal")

In the 25th century, the JAG administered its own bar exam, the Starfleet Bar Examination. (Star Trek: False Vacuum: "Pledge of the Protester")

Lyran StarfleetEdit

The Lyran Starfleet utilized JAG officers to perform intelligence missions, beyond the duties normally assigned to the judicial branch of the Lyran military. However, the right to go in intelligence missions was a right reserved to command-level (and, by extension, flag) officers. (RIS Bouteina: "How the Charter Was Won")

Also, when the opportunity arose, JAG officers could find themselves in position to receive command-track postings like any other officer. Catalena Rinne, a judge under the JAG's jurisdiction, became the first officer of the Enterprise (BC-348). (Star Trek: The Stoneship Files: "Highly Illogical")

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