You’ll get an opportunity to talk to both USAA and Navy Federal banks while in boot camp, they allot specific time to set up new banking/work on existing things! You can ask them about refinancing at that time. Also, once you get to your duty station you can ask about a new insurance rate through USAA.

If you have the opportunity I’d keep the car for A school depending on where A school is located. A lot of a schoolers with cars actually make out well because folks without cars pay them to give them rides and such. A lot of rides share services still don’t have base access.

Ask your recruiter for your orders to basic, once those orders are cut and official you can feed them to your creditors (car loan owner, credit cards, banks, whomever you're paying interest too) and they are legally REQUIRED to lower your interest rates under SCRA. If they do not then you can get your legal team involved during basic. Usually this process is all automated now if you have orders, or is a short 5-10 minute phone call.

The savings in interest could make it worth keeping the car. Honestly though probably just sell and keep expenses low while you're getting laid through basic and first duty station.

Take the advice above and start contributing to your TSP (Thrift Savings Plan) as much as you can afford. Roth and traditional options are available and it's a great plan for all service members.