~~~~~~~~~~~~~~
It is -- but, but greatly diminished in function and importance since the days when...
...the Fleet moored in Guantanamo Bay. Nowadays you never see a capital ship -- and it's only rarely that you even see the odd C-130 at the Leeward Point airfield. And, even then, only during hurricane hunting season...
In fact, if you follow the link in my comment #1, you'll see an architect's proposal for a detention facility occupying "Phillips Park" -- land once set aside for "Fleet Crew Recreation". You can even observe the feature-matching procedure I used to match the CGI sketch site to Phillips Park -- where, to date, nothing has been built...
And -- it's not rumor that recent budgets show specific 8-digit $ authorizations for "Upgrading Prisoner Capacity" at Gitmo.
Besides, why build Naval facilities a ferry-trip across the bay, when there's plenty of land adjacent to the Naval Station?
~~~~~~~~~~~
Ever hear of "intel"? That's how it's done.
TXnMA