The SATO Marine Corps is SATO's space naval infantry to operate anywhere in the Sol System from ships to planets and moons. The Marine Corps operate from ship or base security to infantry and can be deployed from ships to moons aboard SATO Drop Ships.
- Staff Sergeant Usef Omar (Former Commander; KIA)
- Private First Class Todd Kashima (KIA)
- Sergeant Sean Brooks (Commander; Formerly Corporal)
- Private Nunez (KIA)
- The SATO Marine Corps emblem features as the "Omar" weapon accessory.