Go to your local Army recruiter and start the paperwork by getting a Conditional Release form. The recruiter initiates it, and your current unit will have to approve it.
For the most part, it is fine. Most of the civil service/contractors I have worked with are either retired military or at least served prior, so they understand the lingo, and our protocal. The brand newbies can be a problem sometimes because they simply don't understand how things are...