A Rear Admiral is a senior naval officer rank in many navies, including the United States Navy. This rank is typically above a Captain and below a Vice Admiral. Rear Admirals are responsible for commanding fleets, naval bases, or specific missions, and they often oversee significant operational and administrative duties. In the U.S. Navy, the rank of Rear Admiral is divided into two grades: Rear Admiral (lower half) and Rear Admiral (upper half). The insignia for a Rear Admiral includes a star, and they play a crucial role in strategic planning and leadership within naval operations.