There are 3 Northrop/Thornton T-38A aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1961 and 1963.
N638TC
1963 Northrop/Thornton T-38A
Mojave, CA
N38FT
1961 Northrop/Thornton T-38A
Renton, WA
N338TC
Northrop/Thornton T-38A
Van Nuys, CA