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F-19 was just skipped, not used for something black (unless they went in and backfilled later). Northrop wanted F-20 for Tigershark and the Air Force obliged. Andreas has exceprts from the relevant USAF discussions in the F-19 entry here:http://www.designation-systems.net/usmilav/missing-mds.html
F-19 was just skipped, not used for something black (unless they went in and backfilled later). Northrop wanted F-20 for Tigershark and the Air Force obliged. Andreas has exceprts from the relevant USAF discussions in the F-19 entry here:
http://www.designation-systems.net/usmilav/missing-mds.html
