An aerial view of the Naval Station Mayport, Florida (USA)

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Naval Station Mayport (IATA: NRB, ICAO: KNRB, FAA LID: NRB) is a major United States Navy base in Jacksonville, Florida. It contains a protected harbor that can accommodate aircraft carrier-size vessels, ship's intermediate maintenance activity (SIMA) and a military airfield (Admiral David L. McDonald Field) with one asphalt paved runway (5/23) measuring 8,001 × 200 ft. (2,439 × 61 m).[1]Since its commissioning in December 1942, NS Mayport has grown to become the third largest naval surface fleet concentration area in the United States. Mayport's operational composition is unique, with a busy harbor capable of accommodating 34 ships and an 8,001-foot (2,439 m) runway capable of handling most aircraft in the Department of Defense inventory.