Naval Station Mayport / Admiral David L McDonald Field — Jacksonville, United States

NRB is the IATA code for Naval Station Mayport's airfield, officially Admiral David L. McDonald Field, located near Jacksonville, Florida. This facility serves as a military installation supporting the U.S. Navy's Mayport base, one of the largest Navy homeports on the East Coast. Rather than handling commercial passenger traffic, the airfield primarily accommodates helicopter operations and fixed-wing aircraft supporting naval aviation squadrons, fleet logistics, and training tied to the surface ships stationed at Mayport. There is no public terminal or scheduled airline service at NRB. Its runway infrastructure exists to support carrier strike group operations, search-and-rescue helicopters, and personnel transport for the base. Civilian access is restricted, and the field functions purely as defense infrastructure rather than a public airport.