Why NATO does not need one standard surface combatant

Could NATO adopt a common combatant based on an American or British design?

A single standard ship is hard to justify because American two-ocean missions and crewing assumptions differ sharply from most European operating needs.

Geography gives NATO navies different requirements. American warships must routinely cross the Atlantic or Pacific, while many European fleets expect to fight within an ocean or regional sea. Britain and France are exceptions because their overseas territories require ocean crossings. Crew size also makes American designs difficult for smaller navies to adopt. NATO Frigate 90 and the FREMM-derived Constellation programme illustrate the difficulty of reconciling shared designs with national requirements. Canada falls between the European and American cases, with trade and connections across oceans central to its needs.