Montauk Airforce Station, a former part of the nationwide Air Defense System SAGE and officially abandoned in 1989, allegedly continued service as a top secret test laboratory. The work completed there is known as the Project Phoenix, which included the opening of a interdimensional vortex, which allowed time traveling. Montauk Airforce Station is now a part of a National Park, despite the buildings of the old station are off limits to visitors.
Some words to the history as a radar post:
The site with the number Z-45/A-9 GCI started radar service right after the end of World War II. An AN/TPS-1B long range sarch radar was activated at this site in June 1948. This site fed into a primitive control center established at Roslyn. Montauk the was incorporated in a early radar network named LASHUP with the 773rd AC&W Squadron overseeing the facility. In 1951 AN/CPS-5 and AN/TPS-10A height-finders were placed on the site. (Note: The early radars were only 2 dimensional radar, which could not determine the height of an airplane, therefore special radars tilted by 90 degrees were used to measure the height additionally - GS) A year later AN/FPS-3 and AN/FPS-5 radars were operating. Between 1955 and 1956 an AN/FPS-8/GPS-3 made an appearance at the tip of the Long Island site. In the spring of 1957 this site received one of the first AN/FPS-20 units along with a pair of AN/FPS-6 height-finder radars. During 1958 Montauk began SAGE operations.
In December 1960 the first of the specific frequency diversity radars, an AN/FPS-35, became operational at Montauk (Note: It's still there - GS). This powerful radar caused radio interference problems in the vicinity, which caused this radar to be taken out of service in 1961. With the problems resolved, the radar was operational again in 1962 and by 1963 an AN/FPS-26 had replaced one of the AN/FPS-6 height-finder radars. In 1963 the site also had become an FAA/ADC joint-use facility (Note: The radars were now in use by both the military and the civilian air traffic control - GS). Around 1965 the site was removed from joint-status. Montauk came under TAC jurisdiction in 1979. The facility was decommissioned in 1989. A site at Riverhead (Z-315/5-52) assumed coverage.
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Information which strongly suggests that some most unusual things were going on at Montauk Air Force Station in the late 1950s and early 1960s comes from a fellow who's father was an Air Force Colonel and assistant base commander at Mitchell Air Force Base in central Long Island.