AN/FPS-107 had been replaced by an AN/FPS-91A search set operated by the FAA. The AN/FPS-116 was removed c. 1988 Operation Have Horn In 1969 North Truro Air Force Station was the location of Operation Have Horn, the launching of sounding rockets under project Nike Hydac. On completion of the operation in 1970, the used devices and equipment were returned to the White Sands Missile Range. Closure After the end of the Cold War, in 1994, the Air Force closed down operations at North Truro. Most of the land was transferred to the National Park Service. In the late 1990s, an ARSR-4 replaced the AN/FPS-91A. when it joined the Joint Surveillance System (JSS). Several of the facilities have fallen into disrepair while some are in the process of renovation. The Gap Filler at Westboro is intact and has what appears to be a water tower and several radio broadcasting towers. The other two Gap Filler sites have been obliterated and redeveloped. The former Texas Tower No. 2 (TT-2) troposcatter communications site, just south of the housing area, is also accessible on foot. All that remain of the tropo facility are the building foundation (a concrete pad with a few floor tiles) and three-each concrete footings for the three tropo dish antennas. At the main site, the fence around the former cantonment and technical areas has a gate on the ocean-facing side. All of the original USAF radar towers are gone. The only radar tower now is the ARSR-4. The buildings are each in various conditions, however all are in derelict condition with the exception of the few buildings that are being repaired. The homes in the family housing area are falling apart and some have been vandalized. A few buildings had been torn down, including the station chapel. The National Seashore intends to remove most of the remaining buildings as soon as funds are available.. The former GATR site located approximately 1.2 miles southeast of the base at Longnook Beach has been demolished, and all of the radio poles have been removed. The site is now home to an FAA NAVAID station. Redevelopment NTAFS itself was given to the Cape Cod National Seashore and is now being redeveloped into the Highlands Center. This project includes the building of a performing arts center, and other facilities to meet the needs of the National Park Service as well as the community. It is