The VF's are the generation of fighters that eventually came to production after the further testing of Sabre fighters.
(Time line is 2579 so no questions asked, alright? 100% created for my own comic.)
Technology for the VF series was adapted from the RECON objective.
The VF - 121 first saw production in 2565. It is smaller and more manouverable than the newer and larger MRFP - 201VF.
But the hull of the newer fighter can sustain much more damage than any earlier model.
Model 121 is commonly called "scout", and the VF - 121B is equipped with an enhanced radar array.
Also, another known slang for this fighter is "rocket" due to its speed.
Wings, eh? Space, eh? Unlike the Sabres these aircrafts can exit and reentry orbit like a large class space ship. And that is why it has wings, for "gravity environment". Hah.