Help ID an old knife of my Dad's

[skeeter4206]

Here are pictures of an old knife my dad has had since I was a kid. I always though it was a bayonet, but after having some of my own I dont think it is. It is a folding knife. The markings on the Knife as far as I can read are "T.F. 2AST-T" maybe!

I have been on line and researched the markings and only newer style knifes come up. Maybe some of the members can help me out, so I can tell my pops what he has.

Thanks
Skeeter Barnes