thumb|right|upright|A radome at [[RAF Menwith Hill, a site with satellite uplink capabilities believed to be used by ECHELON]] thumb|right|RAF Menwith Hill, [[North Yorkshire, England]] thumb|right|Misawa Air Base Security Operations Center (MSOC), [[Aomori Prefecture, Japan]]
thumb|right|upright|A radome at [[RAF Menwith Hill, a site with satellite uplink capabilities believed to be used by ECHELON]] thumb|right|RAF Menwith Hill, [[North Yorkshire, England]] thumb|right|Misawa Air Base Security Operations Center (MSOC), [[Aomori Prefecture, Japan]]
ECHELON, originally a secret government code name, is a surveillance program (signals intelligence/SIGINT collection and analysis network) operated by the five signatory states to the UKUSA Security Agreement: Australia, Canada, New Zealand, the UK and the United States, also known as the Five Eyes.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).