The Tide-class tanker are a proposed class of four large fast fleet tankers for the Royal Fleet Auxiliary (RFA) of the United Kingdom. Originally known under the project name Military Afloat Reach and Sustainability tankers (MARS), they will be tasked with providing fuel, food, fresh water, ammunition and other supplies to Royal Navy vessels around the world. The vessels were ordered on 22 February 2012 in an order worth £452 million. The ships were designed by BMT Defence Services in Bath, England but will be constructed in South Korea and have a projected in-service date of 2016.