I see you've been away for a LONG time! Navy got out of Floyd Bennett in '69 and Nixon created Gateway National Park
(best thing he did IMHO). Gateway includes Riis Park, Fort Tilden, Sandy Hook, NJ and everthing within and along the perimeter of Jamaica Bay.
BTW, to keep the subject on-topic I've seen plans of turn of the 20th-Century Brooklyn that depicted Jamaica Bay/Floyd Bennett Field area as a deep-water port with a rail connection from the LIRR Bay Ridge
snaking down through what is today Mill Basin, and running adjacent to Flatbush Avenue to serve the port terminal. The advent of the first World War put an end to those plans and aviation took a foothold on the Bay (the rest as they say is history).
Planes don't always take off from FBF these days, but there is a group called HARP
(Historic Aircraft Restoration Project) that gets a vintage plane or two in the air once or twice a year. They have a HUGE C-87 (IIRC) cargo plane in one of their hangars on the Bay side of the field. Lots of neat early aviation stuff over there. They may have a better collection than Mitchell Field.
Regarding Brooklyn Terminal: The big building that housed the Key Food headquarters is being demolished to make way for either a Home Depot or some self-storage facilities. Not exactly sure at this point what's going on with the property. All that I can be sure of is that the two track siding is down to one as of yesterday morning. What that means for NY&A is less capacity at that location. Doubt if both tracks were really necessary since the 1960's. Truck traffic took alot of the produce deliveries away.
Pennsy, hope I was able to answer your queries.