The speed with which Point Arena AFS came into existence reveals how urgently the United States felt its vulnerability in 1950. On July 11, the Secretary of the Air Force requested emergency approval to build a permanent radar defense network. Ten days later, on July 21, the Secretary of Defense agreed. The Army Corps of Engineers began construction almost immediately at the site on Hill Peak Road -- later renamed Eureka Hill Road -- perched above the Mendocino coast with an unobstructed view of the Pacific. By November 27, the 776th Aircraft Control and Warning Squadron was activated and operational, running AN/FPS-3 and AN/FPS-4 radars. The station functioned as a Ground-Control Intercept site, meaning its operators did more than watch -- they actively guided interceptor aircraft toward unidentified contacts picked up on their scopes.

In late 1960, Point Arena joined the Semi Automatic Ground Environment, the Cold War's most ambitious attempt to network America's air defenses into a single computerized brain. The station began feeding its radar data to Direction Center DC-18 at Beale Air Force Base, where massive IBM computers processed information from stations across the region, determining whether each radar blip was friend, foe, or weather. The 776th was redesignated a Radar Squadron (SAGE) in January 1961. When the San Francisco Air Defense Sector closed in August 1963, Point Arena transferred its data feed to the SAGE Data Center at Adair AFS in Oregon. That same year, the station received the AN/FPS-24 -- the first production model of a new long-range search radar. The technology changed constantly; the mission stayed the same: watch the sky, every hour of every day, and raise the alarm if something appeared that shouldn't be there.

The radar told only part of the story. Point Arena also maintained ground-to-air communications with every military aircraft in its coverage area, and the equipment that made this possible sat several miles from the radar domes at a separate facility called the GATR site, perched at the crest of Eureka Hill Road. The separation was deliberate -- radar energy interfered with radio gear, so the transmitters and receivers needed distance. The GATR site ran single-frequency UHF AM equipment around the clock, covering frequencies between 225 and 400 megahertz. A Time Division Data Link transmitted targeting data from the SAGE direction center directly to aircraft in flight, closing the loop between the computers analyzing the threat and the pilots responding to it. The equipment roster from 1968 and 1969 reads like an alphabet soup of military designations: AN/GRT-3, AN/GRR-7, AN/GRC-27, AN/KWT-6. Every piece ran continuously, every shift was staffed.

The Air Force closed Point Arena AFS in 1998 and transferred the property to the Federal Aviation Administration, which continues to operate a Joint Surveillance System radar at the nearby Rainbow Ridge site. But the old station itself became an unwanted inheritance. Since the late 1990s, the Department of Defense has tried to give the property away to local government agencies, and none have been willing to accept it. The problem is straightforward: decades of military operation left behind lead paint and asbestos contamination, and the cost of environmental cleanup exceeds whatever value the remote hilltop property might hold. Its distance from any major population center makes the economics even worse. The former radar station sits in a kind of institutional limbo -- too contaminated to develop, too remote to attract investment, too historically interesting to entirely forget. The road that once carried airmen to their shifts scanning the Pacific sky still winds up the hill, under a name the locals changed at some point and no one seems to remember exactly when.