Looks like they have plenty of Baseball fields and a lacrosse facility where they could land. Or perhaps Martin Luther King Blvd. (Yes, I also spotted the 250 foot long runway at the Air Force Base.) Looks like most of the facility has been converted to residential and recreational for the brass.
There is "...a large heliport facility, primarily used by Marine Helicopter Squadron One (HMX-1) in support of "Marine One" presidential transport operations...", so it looks like they could transport the prisoner there from the USS New York using a V-22.
sources:
http://en.wikipedia.org/wiki/Naval_Support_Facility_Anacostia
and
http://www.navy.com/about/equipment/vessels/uss-new-york.html
The CIA has assets there