Previously known during design development as the
Military Afloat Reach and Sustainability (MARS) Tanker, these double-hulled ships will carry bulk fuel, oil and fresh water to supply
Royal Navy ships at sea, from c 2016.
| 2012-feb | Ordered | Ordered  A137 RFA Tiderace | |
| 2012-feb | Ordered | Ordered A136 RFA Tidespring | |
| 2012-feb | Ordered | Ordered A138 RFA Tidesurge | |
| 2012-feb-22 | Ordered | Ordered A139 RFA Tideforce | |
| 2014-jun-27 | Laid down | Laid down A136 RFA Tidespring first steel cut at DSME Okpo yard. | |
| 2015-dec-24 | Laid down | Laid down A139 RFA Tideforce Yard No. 7047 | |
| 2016-dec-01 | | A137 RFA Tiderace Naming ceremony at DSME Okpo, South Korea. Yard no 7045. | |
| 2017-jan-14 | Trials | Trials A137 RFA Tiderace start of builders pre-delivery trials | |
| 2017-jan-21 | Launched | Launched A139 RFA Tideforce | |
| 2017-apr-02 | Homeport | Homeport A136 RFA Tidespring Arrived in Falmouth at Duchy Wharf, for UK weapons and communications fit | |
| 2017-jun-29 | | A137 RFA Tiderace accepted off contract by RFA at DSME, S Korea | |
| 2017-sep-25 | Homeport | Homeport A137 RFA Tiderace Arrived in Falmouth at Duchy Wharf, for UK weapons and communications fit | |
| 2017-nov-27 | Commissioned | Commissioned A136 RFA Tidespring Joined the RFA Fleet at Portsmouth as the 1st MARS tanker | |
| 2018-jan-24 | | A139 RFA Tideforce naming ceremony at DSWE Okpo | |
| 2018-mar-27 | Homeport | Homeport A138 RFA Tidesurge Arrived in Falmouth at Duchy Wharf, for UK weapons and communications fit | |
| 2018-apr | Port Visit | Port Visit A136 RFA Tidespring taking on fuel at the Garelochhead Oil and Fuel Jetty. | |
| 2018-jul-30 | Aircraft | Aircraft A137 RFA Tiderace 1st at sea landing of a Merlin HM.2, from 814 NAS | |
| 2018-aug | Deployment | Deployment A137 RFA Tiderace departed Portland as logistic support for HMS Queen Elizabeth maiden deployment on 11 week WESTLANT 18 exercise off east coast of USA. | |
| 2018-aug-02 | Commissioned | Commissioned A137 RFA Tiderace Joined the RFA Fleet at Portland as 2nd Tide class MARS tanker | |
| 2018-aug-15 | Homeport | Homeport A139 RFA Tideforce Arrived in Falmouth, for UK weapons and communications fit | |
| 2018-nov | Trials | Trials A138 RFA Tidesurge Conducting First of Class Flying Trials with RAF Chinook. | |
| 2018-nov-02 | Port Visit | Port Visit A137 RFA Tiderace In Plymouth Sound, at C Buoy | |
| 2019-feb | Refit | Refit A136 RFA Tidespring Feb 2019 to Cammell-Laird for periodic hull inspection and installation of Phalanx mounting points only. Planned 4 month alongside has extended significantly. | |
| 2019-may-04 | Port Visit | Port Visit A139 RFA Tideforce Tied up at D Buoy in Plymouth Sound. | |
| 2019-aug | Refit | Refit A137 RFA Tiderace Aug 2019, to Cammell-Laird for periodic hull inspection. In queue for work once RFA Tidespring completes. Refit complete by Jun 2020 | |
| 2019-aug-19 | Port Visit | Port Visit A138 RFA Tidesurge visited Crombie for re-storing | |
| 2019-sep-02 | Aircraft | Aircraft A139 RFA Tideforce Wildcat HMA.2 of 815 NAS embarked as Tideforce Flt, in preparation for WESTLANT deployment later in the month. | |
| 2019-sep-26 | Deployment | Deployment A139 RFA Tideforce Supporting HMS Queen Elizabeth, HMS Dragon and HMS Northumberland during WESTLANT19, off US east coast. | |
| 2019-oct-05 | Deployment | Deployment A138 RFA Tidesurge Exercise Joint Warrior 19-2 Participated in JW19-2 | |
| 2019-dec-20 | Port Visit | Port Visit A136 RFA Tidespring alongside at HMNB Devonport for Christmas | |
| 2020-may-15 | Deployment | Deployment A139 RFA Tideforce secured to C buoy in Plymouth Sound. | |
| 2020-sep | Deployment | Deployment A136 RFA Tidespring participated in Joint Exercise in high arctic with KNM Thor Heyerdahl, USS Ross and HMS Sutherland. | |
| 2020-sep-21 | Deployment | Deployment A139 RFA Tideforce Exercise Joint Warrior 20-2 Participated in Ex Joint Warrior 20-2 off NW Scotland | |
| 2020-oct-17 | Port Visit | Port Visit A139 RFA Tideforce alongside at Loch Striven after JW20-2. | |
| 2021-mar | Deployment | Deployment A137 RFA Tiderace Supprting HMS Lancaster and HMS Westminster as part of JEF international martime security and freedom of navigation deployment to the Baltic. | |
| 2021-apr-29 | Refit | Refit A137 RFA Tiderace to Birkenhead, for refit | |
| 2021-may-06 | Deployment | Deployment A136 RFA Tidespring Exercise Strike Warrior 2021 performed RAS with HMNLS Van Amstel, off NW Scotland. | |
| 2021-jul-07 | Deployment | Deployment A136 RFA Tidespring Transit of Suez Canal from Mediterranean, with CSG21 main force. | |
| 2022-sep-21 | Port Visit | Port Visit A139 RFA Tideforce visited Bahamas with Wildcat HMA.2 ZZ528 embarked. | |
| 2024-mar | Deployment | Deployment A136 RFA Tidespring Exercise Steadfast Defender 2024 participated in Ex Nordic Response around Norwegian and Arctic waters | |
| 2025-may-06 | Port Visit | Port Visit A139 RFA Tideforce visited Gibraltar | |
| 2025-may-19 | Port Visit | Port Visit A136 RFA Tidespring arrived in Cape Town | |
| 2025-dec-09 | Port Visit | Port Visit A136 RFA Tidespring arrived at Gibraltar to end her CSG25 Indo-Pacific deployment. Disembarked 814 NAS Merlin of Swordfish Flt. | |
Maud class
Aircraft
Daewoo Shipbuilding Marine Engineering - Geoje-Daero