Rear Admiral (Lower Half)

 was the lowest flag rank within the 's and Marine Corps. Within the Navy, holders of this rank typically oversaw small task forces, or else were the commanding officers of very large capital-class vessels or command ships. They also often served as staff officers within larger command structures. In the Marine Corps, holders of this rank were typically administrators, overseeing the operational deployment of multiple -sized formations. Lower-half rear admirals were subordinate to those who held the upper half of that rank both within the Navy and the Marines.