I photographed a Northrop F-5B Freedom Fighter at the Pima Air Museum and F-5E Tiger II examples at the Evergreen Aviation Museum and Yanks Air Museum in Chino. The -A and -E models were single-seat versions, while the -B and -F models were two-seat versions. There are only two YF-5A prototypes left, one in Seattle and one in Dayton (both pictured below).
YF-5A Freedom Fighter 59-4987
Museum of Flight
YF-5A Skoshi Tiger 59-4989
NMoUSAF 2018
F-5A 68-9085
Pearl Harbor 2025
F-5B Freedom Fighter 72-0441
Pima Air Museum 2017
F-5E 74-1519
Ex USAF 74-1519. Passed to U.S. Navy and heavily modified aerodynamically for DARPA test flights attempting to reduce the noise level of sonic booms.