You can walk into the Army Recruiting station or the Recruiter can catch you while you're walking past a Recruiting Station. They'll most likely sweet talk you into joining the Army saying how awesome the Army is. They'll introduce all the benefits the Army has to offer (often inflated). They'll set you up with a practice ASVAB test, to see what career path you're most likely be eligible for. Once all the paper work is done after about several weeks or so, they'll send you the local MEPS, where you'll take the real ASVAB, get physical, and talk to career counselor, which is a ALL the process. You pick your MOS. And you're finally in.

No interview, however you had to take the ASVAB (Armed Services Vocational Aptitude Battery) a multiple choice test used to determine qualifications for enlistment. The ARMY requires a High School diploma or a GED.