The Bermuda bases consisted of 5.8 km2 (2.2 sq mi) of land, largely reclaimed from the sea. The USAAF airfield, Fort Bell (later, US Air Force Base Kindley Field, and, later still, US Naval Air Station Bermuda) was on St. David's Island, while the Naval Operations Base, a Naval Air Station for maritime patrol flying boats, (which became the Naval Air Station Annex after US Naval air operations relocated to ) was at the western end of the island in the Great Sound. These joined two other air stations already operating on Bermuda, the pre-war civil airport on Darrell's Island, which had been taken over by the RAF, and the Fleet Air Arm's Royal Naval Air Station, HMS Malabar, on Boaz Island.