How do you get basic allowance for housing in the military?

The allowance is based on several aspects including geographic location of duty, pay grade, and how many dependents you have. There are resources available to help you through the process and will walk you through the entire relocation process including setting up your utilities, establishing an escrow account, and even help you obtain life insurance. I would recommend that you try there and research as much information as you can in order to obtain the biggest benefit.