Olympus has a line of cameras called "Stylus".
All are dust and water resistant.
Their most rugged Stylus is the Stylus 770.
Water and Dust Proof.
You can even take it underwater. (maximum 30 feet down).
It is also rated to be shockproof.
Here is a review:
We heard from one man who had been to Iraq and he said that the sand in Iraq is not like the sand we see at the beach. Their sand is much finer.....closer to talcum powder.
For that reason, I suggest you select a camera that has an enclosed lens instead of one where the lens extends out.
I'm leaving for a tour of duty to Iraq soon, and I would like to get a durable camera to take with me, that will turn out decent pictures. Any suggestions? Keep in mind it needs to be Marine proof!