You have a sit down interview with a recruiter. You have other interviews with medical, psychological, and financial assessments. You will be signing a lot of paper work. If you don't know your SSN, trust and believe you will after your contract signing.
I applied in-person. The process took 2 weeks. I interviewed at Arkansas Army National Guard (New York, NY) in Nov 2015
Interview
Face to face interview, in front of a Panel of experts. I was scheduled a time by one of those involved with the interview process, I arrived about 30 minutes early. They interviewed all the candidates on the same day, asking the same questions of each.