 F-boats were succeeded in operational duties by Type 35 and s. "Flottenbegleiter" remained in service as advanced training vessels.It was not until the Royal Navy's of 1944 that a British design classified as a "frigate" was produced for fleet use, although it still suffered from limited speed.These anti-aircraft frigates, built on incomplete hulls, were similar to the United States Navy's destroyer escorts (DE), although the latter had greater speed and offensive armament to better suit them to fleet deployments.