Added a basic version of the T-38. It doesn't have working cockpit or animations.

Used this model for the exterior - https://sketchfab.com/3d-models/northrop-t-38-talon-c87423bd3de144e8909addafd925...

Merged cockpit interior from https://sketchfab.com/3d-models/northrop-t-38-talon-d5d22b4b37944f0e9bb1e77ede02...

Hid the landing gear. Might look at animating them if there is interest later. Will see how the download count goes :-)