Interesting article about Tacit Blue: https://www.thedrive.com/the-war-zone/41892/new-light-shed-on-the-once-top-secret-tacit-blue-aircraft-by-veteran-program-

Interesting article about Tacit Blue: https://www.thedrive.com/the-war-zone/41892/new-light-shed-on-the-once-top-secret-tacit-blue-aircraft-by-veteran-program-manager https://www.thedrive.com/the-war-zone/41892/new-light-shed-o... tl;dr from the article: "Tacit Blue's notional concept of operations involved flying over or very near the forward edge of the battlefield at around 25,000-30,000 feet and orbiting overhead at 250 knots or so while its radar scanned the area below."