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History according to Google:
Opened in 1944, Lymington was a prototype for the type of temporary Advanced Landing Ground type airfield which would be built in France after D-Day, when the need for advanced landing fields would become urgent as the Allied forces moved east across France and Germany. It was used by the Royal Air Force, Canadian and the United States Army Air Forces. It was closed in 1946 after two years of being utilized as a storage area for the Royal Navy.
Lymington was known as USAAF Station AAF-551 for security reasons by the USAAF during the war, and by which it was referred to instead of location. Its USAAF Station Code was "LY".