Florida is somewhat lacking in deserts... but it has beaches. You can find sand dunes on some Florida beaches that will hide people. Or, people can dig into the sand at a Florida beach, and create a small berm that looks like a dune, behind which they can hide.
Deserts where the US has been engaged in conflicts, however, have larger dunes... or deep arroyos (although they call them wadis in most of the places our guys fight)... or hills, ridges, mountains...
The areas around bases may be very flat. By the nature of guerilla warfare, though, the bad guys often dress like the locals, and may get very close before doing anything that gives them away. So, even with long sight lines, the bad guy may be closer than comfortable.
Distances where conflict happen can vary greatly; as somebody else said, it's not a video game map.
This will be my last post in this thread. For one thing, the infantry guys have started showing up, and they can carry the argument better than the aviator. For another, the OP is giving indications that he really isn't interested in real answers to his supposition.