Here's my list, based on info I found at
http://www.designation-systems.net/usmilav/codenames.html some time ago (added a couple of bits in it):
Senior Blade ELINT/SIGINT program, U-2 related
Senior Blue Air-to-Air Anti-Radiation Missile (?)
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Senior Book U-2R COMINT system, used on flights from OL-20, 1970s-1980s
Senior Bowl 2 B-52Hs '60-0021' and '60-0036', modified to carry 2 Lockheed D-21B "Tagboard" reconnaissance drones
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Senior Citizen Classified program; probably a projected Special Operations stealth and/or STOL transport aircraft
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Senior CJ Northrop/Boeing/LTV B-2A stealth bomber; continuation of Senior Ice
Senior Crown SR-71 reconnaissance aircraft, based on CIA-sponsored A-12 "Oxcart"
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Senior Dance ELINT/SIGINT program, maye U-2 related ?
Senior Glass ELINT/SIGINT program, U-2 related
Senior Guardian Grob/E-Systems D-500 Egrett, high-altitude surveillance / reconnaissance aircraft, German-US cooperation, 1980s
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Senior High Study program for potential stealth applications in 1978, which led to the F-117A, B-2A and other stealth aircraft
Senior Hunter C-130E/Hs used for Senior Scout reconnaissance/ELINT missions, and/or maybe support aircraft for EC-130E(RR) / EC-130E(CL) Commando Solo missions; Conflict? Support of the shelters used by Rivet Rider, Volant Solo, Senior Scout
Senior Ice ATB (Advanced Technology Bomber) stealth bomber design by Northrop; won design competition against Lockheed Senior Peg and was developed as B-2A under Senior CJ program
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Senior Jade USAF Special Access Program
Senior Jump U-2 ELINT/SIGINT program, related to Senior Book
Senior Keyhole covers all overhead (photo) reconnaissance satellites
Senior Lance U-2R with Goodyear SAR in inflatable dome
Senior Mace SIGINT exploitation system
Senior Open U-2R with rotating LOROP camera nose system
Senior Peg ATB (Advanced Technology Bomber) stealth bomber design by Lockheed/Rockwell; lost design competition against Northrop/Boeing N-14 Senior Ice
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Senior Pennant Classified stealthy air-launched cruise missile; USAF study under JTACMS (Joint Tactical Missile System) program; evolved into AGM-137 TSSAM (Tri-Service Standoff Attack Missile)
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Senior Prom Stealthy air-launched cruise missile by Lockheed
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Senior Ruby U-2R with E-Systems ELINT/SIGINT gear
Senior Saber ELINT/SIGINT program, maybe U-2 related ?
Senior Scout PHOTINT/ELINT package/modification (a roll-on/roll-off shelter, fitted with DCPS - Data Collection & Processing System) for C-130E/Hs, including: EC-130E(CL) '63-7815', C-130H '74-2134', C-130H '89-1185'
Senior Shuffle ELINT/SIGINT program, maybe U-2 related ?
Senior Sky ATF (F-22) development of stealth fighter, Lockheed
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Senior Smart ELINT/SIGINT program, maybe U-2 related ?
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Senior Span U-2R satellite data link, aka 'C-Span III'
Senior Spear U-2R with ELINT/SIGINT pods, at least 4 different Phases: I, II, III, IV, 1980s
Senior Spur ELINT/SIGINT program, U-2 related
Senior Stretch U-2R with ELINT/SIGINT pods
Senior Surprise AGM-86C CALCM (for Operation Desert Storm in 1991)
Senior Trend Lockheed F-117A stealth fighter, follow on to Have Blue
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Senior Troupe AN/AIC-38(V)2 communication system
Senior Warrior Marine Corps PITINT/ELINT system; uses Air Force Senior Scout on USMC C-130s
Senior Year covers all overhead (photo) reconnaissance aircraft; SYPO (Senior Year Projects Office), located at Warner-Robbins AFB, GA, (oversees all SENIOR programs, not all are on aircraft; the U-2 main logistics support depot is also at Warner-Robbins); SYERS (Senior Year Electro-optical Reconnaissance System, not only used for U-2s
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