+1 for the REO. A REO Grand can be thrown in your dishwasher... how's that for waterproof? Body is solid aluminum, feels substantial in your hand. All new REO Grands are sub-ohm capable with a gold plated beryllium copper fused spring (if you have a short, the spring will collapse as a safety feature!).
Last time I deployed to Kandahar, I was a smoker, but I've been using a REO for quite a few months now, and I'd say topped with a RM2 (great for flavor, small chamber size and ceramic deck, makes building easier, less chance of shorting on the base), spare wire/cotton/batteries, you'd be set. 6ml's of on board juice capacity, fully mechanical, user repairable (repair kits available to buy), probably bulletproof (at least if you absolutely had to, the aluminum casing could drive nails in, or you could throw it and knock someone out with it), great customer service from Rob (redeyedancer), great support in REOville (there's a few of us AD folks in there, me and Xobeloot at minimum). If you see a color of REO that you want, but it isn't available on the website, just PM Rob and he might have one that just hasn't been listed yet (hammertones are supposed to be the hardest/most durable finishes available). Also, he sometimes has blemished mods that he sells for a little cheaper, but not always available. I think he does custom paint sometimes also, possibly for an upcharge (not really sure on that, best to ask him directly).
If I got the chance to go back, I'd take 2 LP
REO Grands, 8 Sony VTC5's (some left as spares for swapping out later, not all in rotation at the start), 1 quality 4 bay charger, 3
LP RM2 atties (one is extra just incase you actually manage to break one) (or 3 BF modified atties of your choice), 2
REO Grand repair kits (cheap insurance!), some juice to get me by until I got a care package in, 1 spool of resistance wire, 1 box of
Koh Gen Do Japanese cotton pads, a small cartometer (for ohming out builds, if no DMM is available on site), and small zip lock bags. Get a Vaultz case like this:
Large Locking E-Cigarette Case - Black - Vaultz - VZ00493 if you didn't want a Pelican case, to store everything. Probably forgetting a few things.
Hope that helps some!