Franklin Roosevelt actually said...

At no time shall any person, other than persons on public vessels of the United States, enter either of the naval defensive sea areas herein...

At no time shall any person, other than persons on public vessels of the United States, enter Culebra Island Naval Defensive Sea Area

the airspaces over the said territorial waters and islands are hereby set apart and reserved as naval airspace reservations for purposes of ...

At no time shall any aircraft, other than public aircraft of the United States, be navigated into any of the naval airspace reservations her...