I applied through an employee referral. The process took 2 months. I interviewed at SOC (Chantilly, VA) in Mar 2015
Interview
You must already have armed security experience. Military combat arms is a big selling point. You must be able to get a secrete clearance and pass a physical fitness test.
Interview questions [1]
Question 1
They asked about specific military experience, such as any combat experience and any overseas work experience...especially in a high threat environment.