Pretty quick and easy referral process from a friend who was a current employee deployed to Afghanistan. After a phone screening, I went in for an in-person interview. Met at a cafe around the corner from the office since I didn't have the building badge. The interview was pretty straightforward since my resume was basically perfect for the job. It was more about seeing how I'd be able to handle the stress of working 80+ hrs per week in an unpleasant place.
After that interview, I had a conditional offer requiring medical and drug testing and a more thorough background investigation. Then came the unconditional offer.