(EDIT: Maybe the best advice of all....Please, please, please don't show up at the clinic in desert cammo trauma pants with a gazillion pockets, a special forces backpack loaded with lots of cool, dangly things that hang off of the outside, walking like you just watched the first few Rambo movies. You'll look like a total tool and it will take a while for anyone to take your seriously afterwards...
(And yeah, I wish someone would have told me that but I'm guessing that they'd mistakenly assumed I wasn't a complete idiot...)
(Ok, I wasn't that bad, but I did see a ton of wankers show up looking more or less like that.)
As was said above by my betters... Depending on the gig you get you may end up in a meat grinder like BAF where we saw 15-25 pts/day with full documentation, or a really slow gig where you'll see one patient every several days. What you won't be doing, regardless of what people are going to want to convince you of, is dodging bullets and sprinting across dust showered fields answering the screams of "Medic!! We need a medic!!" though many remote medics will try and convince you that 'their' gigs were like that.
I was returning to Afg sitting next to a guy that was telling the guy next to him, "Yeah, I'm going to BAF. My buddy tells me that they fly us in on old Russian helicopters and most of the guys lay on the floor because you can't breath sitting up for all of the cigarette smoke!" I said, "Brother, your buddy is filling you full of shit.." He said, "You don't know! That's how our company goes in!" I said, "Man, you need to work for a different company because everyone else goes in on a commercial airliner."
The point being that you'll hear all sorts of nonsense, but most likely the job will be much less than what you're used to doing only you'll get to brag about doing it in Afghanistan, which really is cool as hell....
Warm weather clothes in the summer are a must, and layers, as Chris mentioned important for the winter, but for the most part you'll always be comfortably air conditioned cool in the summer and warm as toast in winter as a medic. You'll be given a ton of respect that you don't really deserve, and if you're like most you'll accept it, strut around enjoying it, and even come to believe that you do in fact deserve it, which should make you ashamed.
Get the time differences now and make plans to chat with your family. If you don't use a program now like the chat utility in Gmail, then learn how to use it and make sure that everyone you love knows how to use it too.
Make plans to productively fill your free time, as almost certainly that will be your biggest enemy. Learn to network with other medics. Contract medicine is fickle and I PROMISE you that you will at some point be woken up, or stopped in the middle of your day to someone saying, "Pack your gear. You're heading home tomorrow. We lost this contract. We'll call you if we need you again."
On that same note....PUT ASIDE MONEY FOR SEVERAL MONTHS OF LIVING EXPENSES! You will be making more than you're used to and though you have already made big plans to pay off all of your bills and save money to go back to school, I'VE NEVER TALKED TO ANYONE THAT FOLLOWED THOSE PLANS. Sorry for the caps, but you'll soon see why I felt them to be necessary.
Before going to Afg akflightmedic gave me the same advice and I promised to be smart and follow it, but of course didn't. If you don't, you'll end up like 99% of the medics that I know. You will spend all that you make, learn to live and expect a different standard, get the "See ya!!" talk from your company and be forced to suck the dicks of every recruiter around to find another gig so that you can "get by." Thankfully that's a habit that I've broken, but only because my friends have helped me land on my feet when I was out of work. But you don't even want to know how many figurative dicks I had to suck in the moments after being suddenly, instantly unemployed in a one income family. Yeah. Not my proudest moments.
Probably the most importat? Nothing is ever true until you see it with your own eyes. You have to learn to ignore promises, ignore rumors....they are the mainstay of the bored in the war zone and we all jump all over them at first. I wish I wouldn't have...
"Holy shit! I just heard from our boss's, boss's, boss, (Shhhhhh He and I are friends. He lay next to me on the Russian helicopter on the way in) that they are going to shut this site down at the end of this month!! No, really! They lost the contract!"
"I just heard, I just heard, I just heard!!" You truly can have an amazingly awesome time, make awesome friends, do really good expanded scope paramedic medicine there...you probably won't, but you can! I miss Afg all the time. I loved it there and would go back but they don't really enough anything any more....
Also, my experience as well is that the Afghanis are kind, generous, amazing people. They care just as much about life, and pain, and loss as you do, they've just seen so much more of it than you have that they don't always react the way that you think that they should. The Taliban is a small pimple on the ass of the giant that is the Muslim and Afghani people. Defining the entire country by them is akin to defining Americans by the relatively few three toothed rednecks that still brag about beating up 'Niggers and queers.' It makes no sense.
Good luck Brother. I'd love to hear how you get on....
Dwayne