I don't remember the name of the program/study, but in the 70's, wasn't there a design study for a microfighter? I don't mean the one carried by then 747, but I think it's related. Somewhere on this site is also another concept of a tiny fighter design from Macair shooting down a Foxbat. I think they came about as part of the ATF/Tactical supercruise research I'm doing. I know Grumman also had another low cost fighter study, but it wasn't as small as that GD or Macair design.