Crystal, that is amazing you have such a well laid out plan this early!! Kudos to you and your husband.
Do you have a niche rental market with military families?!! I think that is a great opportunity and hope you are able to manage the rentals long distance, rather it be through a management company or yourselves. I found a niche rental market in my area and it served me well for many years.
I hope you are able to see your plan of early retirement fulfilled!!!