Thanks. And I've looked at the Musem of Flight's YF-5A with only a glance how many times?
So, in theory, if making an Army fast FAC out of the F-20, it could be designated a dash 156G with the requisite prefix? Or 156M if one wishes to go out seven letters after 156F....
Probably not as according to a former Northrop worker over on Secret Projects the two-seat F-5G/F-20
study of 1982 was designated N-354.
N-156 designations:
N-156T from design PD-2879D; became USAF T-38 TALON advanced trainer
N-156F FREEDOM FIGHTER company demonstrators
N-156F USAF YF-5A FREEDOM FIGHTER lightweight fighter [SS-420A]
N-156A USAF F-5A FREEDOM FIGHTER
N-156B USAF F-5B FREEDOM FIGHTER
N-156C USAF RF-5A FREEDOM FIGHTER
N-156NN T-tail Naval version; from design PD-2706
N-156D carrier-borne fighter developed from N-156NN. Later became N-285B
N-156E lightweight jet fighter using CF-700 engines
N-156TX project "TALLY-HO", no details