I just got back from Iraq a few weeks ago.
I agree with the magazine comments. Lowest Bidder is not the way to go.
The dust over there is no differant than driving around at Ft. Hood. It's not magic dust, it's just dirt and dust, like any other dusty sucky place. Anybody who has been around tanks and Bradleys knows what I'm talking about.
We had more problems with our Humvee's than we did with M4's. On our down days we would go out and "test fire" our M4's, just to put some rounds through them, and had very few problems. My weapon would be dirty after coming back from a mission and it would still fire. 90% of our time was spent on keeping our trucks running. I had more confidence in my M4 than I did my own truck.
Don't get me wrong, I would have dumped my M4 for an HK M416 in a heartbeat, but any weapon will fail if not taken care of.