The six ‘Roofdier’ class ‘frigates’ were all built in the USA with MDAP funds. They were designed to escort slow coastal convoys in Channel and North Sea areas and were operated as a single squadron by the Royal Netherlands Navy. They proved useful for a number of peacetime tasks, especially fishery protection, and some were retained in this role in the North Sea until die mid-1980s.

The Van Speijk class frigates were equipped with Dutch electronics/sensors. The British Leander design was chosen to enable rapid construction to replace elderly escorts for ASW duties and NATO patrol. The ships were thoroughly modernised in the late 1970's. Between 1986-1990 all six were transferred to the Indonesian Navy.