Combat stores ships, or Storeships were originally a designation given to captured ships in the Age of Sail and immediately afterward, used to stow supplies and other goods for naval purposes. Modern combat store ships are operated by the United States Navy and the Royal Navy. The Sirius and Mars classes (for the USA) and the Fort Rosalie and Fort Victoria classes (for the UK) provide supplies, including frozen, chilled and dry provisions, and propulsion and aviation fuel to combatant ships that are at sea for extended periods of time. In other navies, the term for the same type of ship is generally replenishment oiler, fleet replenisher, or fleet tanker and should not be confused with fast combat support ships or tenders.