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https://usmilitaryarchive.com/view-article/41e0af0c-f0f4-4dc7-8d84-1c9ce2a25853/xxiv-corps-radio-intercepts-at-khe-sanh-in-1971
XXIV Corps Radio Intercepts at Khe Sanh in 1971 | US Military Archive
US aircrews bypassed KY-38 encryption at Khe Sanh in 1971, exposing tactical radio traffic to North Vietnamese SIGINT during Operation Lam Son 719.
xxiv corpskhe sanhus militaryradiointercepts