UNREP (Underway Replenishment)

Underway Replenishment (UNREP) is a naval operation that allows ships to transfer supplies—such as fuel, ammunition, and provisions—while both vessels are at sea and moving together. This technique enables ships to stay operational for extended periods without returning to port, maintaining their readiness and combat capability. Using specialized rigging and procedures, crew members transfer materials safely even while the ships are underway, ensuring continuous logistics support during military deployments or missions.