381st Intelligence Squadron battled failing boilers to vacuum signals on Shemya

By Marcus Boone · August 9, 2026

Targets remain blacked out even as special screening and 182 days of arduous training prepared technicians for classified missions on Shemya.

The roof cover cost 60,000 dollars. The boilers were failing. On Shemya Island, a speck of land in the Aleutians where the wind rarely stops and the isolation is a physical weight, the high-stakes work of global surveillance is often a matter of basic maintenance. According to a catalogue entry in the FAS Intelligence Resource Program, this was the state of affairs for the project known as CLASSIC OWL Sensor Reach during the late 1990s.

Shemya served as a critical sentinel for the United States throughout the Cold War, positioned to catch the first whispers of Soviet movement across the Pacific. By 1997, the record shows that the site was still humming with the quiet, invisible labor of signal interception. The FAS mirror of a Navy BUPERS Link communication from January-March 1997 notes that Facility 110—a structure built in 1961 to serve the Department of Defense—housed both the US Navy and the 381st Intelligence Squadron. They were there to perform the "Classic Owl and Sensor Reach classified missions."

182 Days at Winter Harbor

Before a technician ever set foot on the frozen perimeter of the Aleutians or the damp hills of Edzell, Scotland, they had to survive the pipeline. The FAS record specifies that CLASSIC OWL training took place at NSGA Winter Harbor. The duration was 182 days. In the internal language of the military, this was not merely a course but was "considered a PCS move," meaning the personnel were permanently changed in station for the duration of their schooling.

The description of the assignment is telling. It is described as "arduous, but rewarding." In the lexicon of intelligence work, "arduous" is often a euphemism for the mental and physical attrition that comes with monitoring the electromagnetic spectrum in places where there is nothing else to do. The reward, presumably, was the access to the secrets being pulled from the air—secrets gathered by the AN/TSQ-161(V) and AN/TSQ-181(V) equipment deployed at sites like Edzell.

Facility 110

For forty-five years, Hangar 2 on Shemya Island served its primary purpose as a place to keep aircraft out of the wind. But by the time the BUPERS Link was circulated, the hangar had transitioned. It now housed "US Navy trailers" as part of the Classic Owl project. The Navy had signed a letter accepting responsibility for the space, transforming a piece of aviation history into a temporary shell for clandestine electronic listening.

Facility 110 tells a similar story of adaptation. Built in 1961, it was designed for the DoD's early Cold War requirements. By 1997, it was the hub for the 381st Intelligence Squadron. While the missions themselves remained "classified," the physical decay of the site was a matter of record. The 60,000-dollar roof replacement was recently completed, but the boilers—the only thing keeping the technicians from freezing in one of the most remote outposts on earth—were slated for replacement in the "near future."

Special Screening

Access to CLASSIC OWL was not open to any qualified technician. The record explicitly states that "special screening is required." This is the gatekeeping of the intelligence community: a process of vetting that ensures the person operating the AN/TSQ equipment can be trusted with the specific nature of what is being intercepted.

When the government speaks of "special screening" and "classified missions," it creates a void where the actual work exists. We know the equipment used. We know the sites involved—from the Scottish highlands of Edzell to the desolate coast of Shemya. We know the training is half a year long and grueling. What remains hidden is the specific target of the Sensor Reach. The documents tell us who was there and how much the roof cost, but they remain silent on exactly whose signals were being vacuumed out of the atmosphere.

Beyond this BUPERS Link, other archives maintain records on the broader context of these activities. The NSArchive holds files on "International Security and Estonia 2024" and comprehensive analyses of Russian warfare dimensions and cyber conflict in Ukraine. These later records highlight the enduring nature of the electronic battlefield that the 381st Intelligence Squadron was already monitoring decades ago.

The record leaves us with a picture of the intelligence state as a collection of leaking roofs and aging boilers, manned by screened personnel who had spent six months in training at Winter Harbor. The 1997 update ends not with a victory or a discovery, but with the pending replacement of the boilers.