Hi Michael,
Welcome to EH.net. I'm probably the least qualified person to answer your question but it looks like you're new here and I didn't want to leave you with the impression we aren't a helpful bunch here.

This is only what I've heard so take it with a pound of salt. First, getting a security clearance is a big expense for a company and unless they really, really want you, it's unlikely you'll get one. It seems most of those overseas jobs go to former military people that already have the clearance and overseas experience.

I believe there is a website (was it usajobs.com?) that specializes in that type of stuff. Also try Halliburton, Bechtel, etc. An hour or two of google searching should provide some good answers. I seem to remember it was 6 months tours/ 1 month off. From what I've seen posted, the qualifications are very specific, working in technologies I've never heard of.

Now that I've probably discouraged you (sorry), good luck with the job search.

Sorry to hijack the thread, but when has the gov't ever done anything better than the private sector? I'd bet on entrepreneurs and those with hacker mindsets every time. I'll stop now before I get on a roll. 

I was looking at this at one point as well.  It seems that most of the jobs in that area of the world are aimed towards Fed Gov't jobs with security clearances or DoD jobs BUT there are a few IT jobs I've seen in the past.  You may already have these sites but just in case...

http://www.dangerzonejobs.com/artman/publish/index.shtml
http://www.civiliancontractorjobs.com/
http://www.totaljobs.com/JobSeeking/Afghanistan_l1715_t4.html  (currently there's network admin, system admin and dba type jobs)

Good luck!