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While many observers have pointed out that the Air Force’s released “image” of the B-21 resembles a B-2 in many respects, service leaders have been both clear and very “general” about the fact that the B-21 consists of many not-yet-seen technologies. Some observers have said that the Air Force image of the B-21 shows a fuselage without visible exhaust pipes like those seen on a B-2. This could mean absolutely nothing -- or it could be early evidence of next-generation heat-suppression technology designed to remove a stealth aircraft’s detectability by eliminating its radar and heat signature.