Had to name it something, been doing ever since the British kept naming all our stuff. If you can't beat 'em join 'em. Prior to WWII a Sherman was a M4 tank medium and a P-38 was a P-38. After the British got ahold of our equipment it all had names. In an America our kid are child male number 1 child female number 3 do on and so forth.
Well, the T-6 was the Texan for the US and the Harvard for the Brits. Its predecessor was the Yale. If that was a precedent the T-28 should have been named after either a state or a college. Trojan is the USC mascot, so maybe it was something like that. The T-28 was based on a tail-dragging replacement for the SNJ that was designed to also be a light attack aircraft. I'd always assumed the T-28 was based on the P-51 and thus would be a good basis for an unlimited racer, but a friend of mine lent his facility to someone rebuilding one and he pointed out they did not use flush rivets. Cheaper and stronger was more important than speed.
Since the T-28 was a trainer and a Trojan is a brand of protection er "garment" and you want to protect the instructor pilot (who cares about the student) I figure that's where they got it as is ain't no Mustang or Saber!
Boeing YL-15 I have a copy of the manual on the brakes for this airplane if anyone needs one. I do know where one is being rebuilt. View attachment 785159