If you are married before boot camp you will be eligible for on-base, and possibly off-base housing while in A School and Power School. I doubt you will be able to purchase a house there, unless you're also in SC for prototype and get staff pick up. Not only is there the wait time to be eligible for VA loans, you don't make a lot of money as an E-4, and the paperwork alone can take a couple months. I'd wait to buy until you're at your first duty station, then look at second house when you go to shore duty. Oh, a fairly recent change to VA loans, you can now have 2 VA loans (maybe more) as long as the total amount isn't over about $425k-450k (I can't remember the exact number).