A NEW U.S. Military RV Park was scheduled to open on December 1st, 2013 at Aberdeen Proving Ground in Maryland! However, freezing weather has caused them to delay opening until March 1st, 2014.
Although this small 11 site RV Park doesn't open for use until March 1st, information, maps, and photos, have been added to the website. It's highly encouraged to call and make reservation.
Information on the New Aberdeen Proving Ground RV Park can be found here.