Tacit Blue also had to meet a broad radar frequency band no matter where the aircraft was being illuminated since it was for near-front line battlefield surveillance plus had to deal with the infrared, visual, acoustic elements and operating the LPI radar, pretty tall order for that time period. B-2 had to meet the same requirements. Northrop did spend a lot of money to develop their RCS prediction code for any shaped air vehicle which definitely paid off and a lot of pole testing at the range to boot. TSSAM and YF-23 directly benefited from Tacit Blue and I would assume other non-acknowledged programs as well.