Diest / Schaffen Vliegveld -
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A former military airfield located at some 15-20 km on the ENE side of Leuven (Louvain if you have a French language map). No idea what they do there nowadays, probably a general aviation small field.
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It used to be the home and training base of the elite Belgian SAS "Red Berets" 1st Bataillon, and the place where they practiced their first parachute jumps, done then from a balloon, before going to airplanes.
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For me, just a place to have a good cold lager...
Happy contrails