Replenishment At Sea (RAS) is a naval operation that allows ships to refuel and resupply while remaining at sea. This process is crucial for maintaining the operational readiness of naval fleets, enabling them to stay deployed for extended periods without returning to port. RAS typically involves transferring fuel, food, and other supplies from a supply ship to a receiving vessel. During RAS, specialized equipment and trained personnel ensure safe and efficient transfers. The operation can involve various methods, such as connected replenishment or vertical replenishment using helicopters. RAS is essential for sustaining military operations and enhancing maritime security.