Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Valkenburg Naval Air Base is a former air base located just south of Valkenburg, which is part of Katwijk and close to the city of Leiden, that was used by the Royal Netherlands Navy up until 2006, being their base for the Lockheed P-3 Orion aircraft, which were sold to Germany and Portugal, resulting in the closure of the air base. Though officially closed as an airport, it still sees limited use for special events and by gliders and occasionally small piston aircraft, most of which from local flying club Aeroclub Valkenburg. Current plans however are to use the area for housing development, but part of the former Air Base may remain in use for glider flying.