GRSC Marine Corps (Earth-2042)

"First to Fight."

- GRSC Marine Corps Credo

The Systems Alliance Marine Corps was a branch of the GRSC Armed Forces responsible for conducting land-based expeditionary combat operations, using the mobility provided by the GRSC Navy to rapidly deliver forces. Marines were also charged with the defense of Navy vessels and installations from hostile forces. While structured under the Galactic Republic, the Systems Alliance Marine Corps operated closely with the GRSC Naval Command and had some authority within the office. The Marine Corps was one of the five branches of the Systems Alliance Armed Forces.

During the Clone Wars, most of the working military force of the Marine Corps consisted of clone troopers with their own set of equipments, however thousands of enlisted personnel continued serving. Following the Declaration of the New Order and the dissolution of the Galactic Republic into the Galactic Empire, the Systems Alliance Marine Corps was restructured into the Imperial Marine Corps.

Source

 * https://www.halopedia.org/UNSC_Marine_Corps