I look back and wish that I had a Nikonos IV-a or V with a 35mm and 85mm lens for my deployments, especially the Iraq one. Those cameras are incredibly tough, dustproof and have awesome lenses. These days a Nikonos V with a 35mm lens is almost free in comparison to most rangefinder gear. The 85mm lens is pretty cheap too and at the price of the bodies, you could have one body per focal length and be good to go, rain, dust, shamal, haboob or shine. No matter what, those cameras can take the punishment that military photography can dish out.
I took a Leica M2 and M4. Both of them handled deployment and combat well but there were a few issues as well as them not being as well sealed as a camera in the desert should be. For me lens changing was out of the question when out on convoy or patrol so I shot with a 28mm on the M2 and either a 50 or a 90 on the M4. Usually the 50mm.
Good luck and stay safe.
Phil Forrest