I believe so, yes.
sometimes we see planes on the ground with their radar transponders turned on sending their altitude = GND
I believe the TEX, Talon, & Beech Jayhawk are all trainers. Often see them in groups like this in daytime. Isn't there a military base nearby?
"The Northrop T-38 Talon is a two-seat, twinjet supersonic jet trainer. It was the world's first supersonic trainer and is also the most produced. The T-38 remains in service in several air forces. The United States Air Force operates the most T-38s. In addition to training USAF pilots, the T-38 is used by NASA."