Message posted by Peter Merlin (Member since 11/13/2003) on October 11, 2023 at 14:54:11 PST:
When Lockheed restarted the U-2 production line in 1980, the new model was designated TR-1, with "TR" standing for tactical reconnaissance. NASA ordered two of the new models for Earth resources research. The NASA version was originally referred to in-house at Lockheed as the ER-1, but was eventually given the designation ER-2. The TR-1 airframes were later redesigned U-2R and re-re-designated U-2S after new turbofan engines were installed.
In Reply to: The real TR-3 posted by Vahe Demirjian on October 11, 2023 at 14:17:41 PST:
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