While flying from Tucson to Yuma I noticed some rather angular fuzzy lines in the desert that appeared to be in the shape of a ladder. Upon closer inspection, it turned out to be an airfield with delta winged aircraft parked on the runway and in individual aircraft bunkers. I think what I’ve found is an adversaries MIG airbase from the 1960’s used for pilot training. The coordinates are 32.546974 -113.243081, nearest town is Ajo, AZ. I didn’t have time to stop, the 'thopter was rushing me to Yuma for an appointment.
Looks like it’s part of the Barry M Goldwater range, or BMGR for short, by all accounts it’s still in use.
https://en.wikipedia.org/wiki/Barry_M._Goldwater_Air_Force_Range
There’s a similar strip on the south end of San Clemente Island. That’s definitely part of a firing range.