Close inspection of the original 3ds that you provided (containing three copies of the Viper model) revealed that the Viper's model was damaged. Materials were missing, for example, the model was slightly out-of-kilter, and somehow the glass panes of the canopy had gotten out of registration with one another even though they're a single object.
I fixed a very few of the problems so the model superficially looks OK, but I didn't fix the more difficult ones. EG I didn't fix the canopy's glass, although I did make it transparent again.
Below is the 7zipped .an8 model of a single Viper, aligned with Anim8or's axes. and with its stripes restored. I've included the textures that it needs, the ones that I added back into it, which are only a few of the textures that it presumably started with. Below that are screengrabs showing how it looks in Anim8or and Celestia.
p.s. Applying the textures to provide the stripes actually was relatively straight forward.
Part of the damage to the model was the way the textures were mapped onto the right-side engine, the right-side upper and lower wing parts and the right side of the vertical fin. I deleted the damaged objects, selected their left-side counterparts (one at a time), and did a "build -> mirror image... x" to create their replacements.
I created materials names "engine_striped" and "fin" and selected the appropriate texture images in their material definitions. I was pleasantly surprised that simply selecting the appropriate parts of the model and "Apply" drew the images on the parts correctly. Apparently the texture mappings had been preserved on those parts even though the associated materials had been un-defined.