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Naval Air Station Patuxent River (IATA: NHK, ICAO: KNHK, FAA LID: NHK), also known as NAS Pax River, is a United States Naval Air Station located in St. Mary's County on Chesapeake Bay near the mouth of the Patuxent River. It is home to the U.S. Naval Test Pilot School and serves a center for test and evaluation and systems acquisition relating to Naval Aviation.