I had did one for a jungle civilization How would a jungle dwelling civilization utilize powered armor efficiently? , so I decided to do another one, but this one for desert dwellers. Since desert planets are possible, I decided to see how they would work in a desert world civilization.
Please note that the planet isn't entirely made up of deserts, it's just that a vast majority of the planet is desert with water sources in short supply (there are rivers, oases, small landlocked seas and lakes, and one very massive ocean). There are massive mountain ranges though, but much of the planet is desert.
Now, the armors would be used by both rank and file and elite soldiers, with the elites getting more advanced armor variants, while special forces units get specialized variants to be used based on the operations they're conducting. So the suits would be for defensive, offensive, and covert operations.
We're going off the assumption that the civilization doesn't want to damage their environments too much (they're not going to blow up their enemies with nuclear weapons! Sorry Heinlein!), but things like heavy artillery is acceptable.