RFA Argus is a ship of the Royal Fleet Auxiliary operated by the Ministry of Defence under the Blue Ensign. Italian-built, Argus was formerly the container ship MV Contender Bezant. The ship was requisitioned in 1982 for service in the Falklands War and purchased outright in 1984 for a four-year conversion to an Aviation Training Ship, replacing RFA Engadine. In 1991, during the Gulf War, she was fitted with an extensive and fully functional hospital to assume the additional role of Primary Casualty Receiving Ship. In 2009, the PCRS role became the ship's primary function. Argus is due to remain in service beyond 2030. In July 2022 it was reported that the future Littoral Strike Role would be assumed by Argus after a refit to convert her to this role. As of October 2023, Argus had started her deployment to serve as part of Littoral Response Group (South) based out of the UK Joint Logistics Support Base in Oman.

The Royal Fleet Auxiliary (RFA) is a naval auxiliary fleet owned by the UK's Ministry of Defence. It is a component of His Majesty's Naval Service and provides logistical and operational support to the Royal Navy and Royal Marines. The RFA ensures the Royal Navy is supplied and supported by providing fuel and stores through replenishment at sea, transporting Royal Marines and British Army personnel, providing medical care and transporting equipment and essentials around the world. In addition the RFA acts independently providing humanitarian aid, counter piracy and counter narcotic patrols together with assisting the Royal Navy in preventing conflict and securing international trade. They are a uniformed civilian branch of the Royal Navy staffed by British merchant sailors. The RFA is one of five RN fighting arms.