The Piper Cub is one of the most outstanding light aircraft in aviation history, having fulfilled a huge range of tasks. Apart from being a tremendously popular type on the private market, it has been used as a trainer, artillery spotter, air ambulance and many other things. More than 20,000 examples of the original J-3 Cub and derivatives were built, followed by over 15,000 units of the more powerful PA-18 Super Cub. The latter remarkably remains in service as a glider tug, supporting the sailplanes of Belgium's Air Cadets. These 180hp L-21B variants are flown by the Militair Centrum Voor Zweefvliegen/Centre Militaire de Vol à Voile (Military Gliding Centre) based at Goetsenhoven. Four are today in use, a total of five Super Cubs having been obtained by Belgium in 1975 from the Royal Netherlands Air Force.