Its pretty cool to see that you have checked out my neck of the woods! I was raised in Yuma, AZ and have spent plenty of time in the desert out there exploring with my dad as kid.
Out in the Tacna area there is a monument dedicated to the training general Patton did out there and you can still see the camp grounds outlined with little rocks out in the flat areas. Its all on the east border of YPG (Yuma Proving Ground).
Next time your in the Yuma area you should check out the quarter master depot and the Yuma territorial prison. If you haven't already.
Great pics BTW! Thanks for sharing!
Sent from some trail, somewhere