Welcome to the GA. We're a clan, chat community, and O/M guild. Since I suck at explaining things, it'd be good if you mosey'd on down to the homepage, located here. That's where most of the explaining will happen.
I think it'd be best if I put the guild in step-by-step terms.
As a new member, you fill out about 3 applications--The join request (and I do look at those), the initial profile application, and the 'core' profile application. There are three 'cores' (subgroups) to choose from: Infantry, Covert Operations, and Navy. Since everyone naturally flocks to cov. ops, only well-seasoned RPers are allowed in. Three generals regulate these cores by themselves (much like states in the USA would govern themselves).