Unified wild beast sequence, 1926-1962
- XB-1 - Huff-Daland-Keystone
- B-2 Condor - Curtiss
- B-3 - Keystone
- B-4 - Keystone
- B-5 - Keystone
- B-6 - Keystone
- Y1B-7 - Douglas
- XB-8 - Fokker
- Y1B-9 - Boeing
- B-10 - Martin
- YB-11 - Douglas
- B-12 - Martin
- XB-13 - Martin
- XB-14 - Martin
- XB-15 - Boeing
- XB-16 - Martin
- B-17 Flying Fortress - Boeing
- B-18 Bolo - Douglas
- XB-19 - Douglas
- Y1B-20 - Boeing
- XB-21 - North American
- XB-22 - Douglas
- B-23 Dragon - Douglas
- B-24 Liberator - Consolidated
- B-25 Mitchell - North American
- B-26 Marauder - Martin
- B-26 Invader - designation regarding A-26 Invader leaving out 1948 all the way 1966
- XB-27 - Martin
- XB-28 Dragon - North American
- B-29 Superfortress - Boeing
- XB-30 - Lockheed
- XB-31 - Douglas
- B-32 Dominator - Consolidated
- B-33 Super Marauder - Martin
- B-34 Lexington - Lockheed
- YB-35 - Northrop
- B-36 Peacemaker - Convair
- B-37 - Lockheed
- XB-38 Flying Fortress - Boeing
- XB-39 Superfortress - Boeing
- YB-40 Flying Fortress - Boeing
- XB-41 Liberator - Consolidated
- XB-42 Mixmaster - Douglas
- XB-43 Jetmaster - Douglas
- XB-44 Superfortress - Boeing
- B-45 Tornado - North American
- XB-46 - Convair
- B-47 Stratojet - Boeing
- XB-48 - Martin
- YB-49 - Northrop
- B-50 Superfortress - Boeing
- XB-51 - Martin
- B-52 Stratofortress - Boeing
- XB-53 - Convair
- B-54 - Boeing
- XB-55 - Boeing
- B-56 - Boeing
- B-57 - Martin
- B-58 Hustler - Convair
- XB-59 - Boeing
- YB-60 - Convair
- B-61 Matador - Martin (later redesignated TM-61, TM- denoting "tactical missile", cop after all MGM-1 relative unified missile sequence)
- B-62 Snark - Northrop (later redesignated SM-62, SM- denoting "strategic missile")
- B-63 RASCAL - Bell (later redesignated GAM-63)
- B-64 Navaho - North American (later redesignated SM-64)
- B-65 Superman - Convair (later redesignated SM-65)
- B-66 Destroyer - Douglas
- B-67 Crossbow - Radioplane (later redesignated GAM-67)
- XB-68 - Martin
- RB-69 - Lockheed
- XB-70 Valkyrie - North American
- SR-71 Blackbird - Lockheed; SR- denotes "strategic reconnaissance"
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