What decides what navy base you get stationed at?

The Navy decides where someone goes. It's all based off your rank and MOS, and the rank and MOS of people who are leaving other duty station, who's getting promoted and who's getting out. He will get to give a wish list of where he wants to go, but that doesn't mean he'll get one of those places. He will find out about 2 weeks before his finishes A school where he'll be going.