F126 or frigate 126 (Fregatte 126) is a planned German frigate class intended to replace the F123 Brandenburg-class frigates in the German Navy. The ships are to be the largest surface warships to join the Navy since World War II. The first ship is planned to be commissioned in 2028. Until 1 January 2021, the project was known under the working title MKS 180 or Multi-Purpose Combat Ship 180 (Mehrzweckkampfschiff 180), with 180 indicating the classes planned complement.