I applied online. The process took 2 weeks. I interviewed at US Air Force (Randolph AFB, TX) in Jan 2012
Interview
While serving in the Air Force, you have chances to apply for special duties for out of the ordinary type jobs. Do to this you would have to apply for the special duty via a military secure computer and compete for the open position. Based on the overall review of the persons qualifications, if you matched the requirement as the top candidate, you would them be selected for the job. Some of the jobs just require the application online, but other will require more information such as medical reviews, commander recommendations, security background checks.
I applied through a recruiter. I interviewed at US Air Force (Temple, TX) in Jul 2010
Interview
We did not have a hiring or interview process. Just go talk to a recruiter and he will have all the information that you need for joining. Just don't let him lie to you about the life in the military because it is not for everyone.