The CW-21 was designed during the late 1930s. It combined light weight construction with a powerful engine, which resulted in an excellent rate of climb and manoeuvrability, allowing the fighter to quickly reach the height of attacking enemy aircraft, and attack them. The prototype was sent to China as a demonstration copy and an order for three aircraft, plus a further 32 as kits, followed. These would be assembled locally. Only the three production machines arrived in the chaos of war and w...

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.