I suggest consuming as much information as possible via these sources.

Allowing him to simply move in opens up the possibility of ending up with a tenant that has not been vetted or screened, has not paid a deposit, has not provided their info with which to take legal action such as an eviction/send him to collections, etc.

I love seeing military members take action.

I'd love to talk to you and help you figure out a plan of action that works best for you!

But one must start somewhere, one must finally take real life action, and one must continue to fight the good fight (stay focused, don't give up, always strive to learn new things, always network, and keep pushing the limits of your goals). 

@Mitchell Gisi Hire an attorney to file a quiet title action.

Just make sure to consume contents here as much as possible and feel free to ask any questions you may have.

I would recommend you to house-hack and take action when the opportunity comes your way.

You can create an action plan and you will have the proper people in place to execute. 

Any of these actions could trigger red flags for your lender and make the deal fall through.