Franklin Roosevelt actually said...

"It is ordered that all lands owned by the United States within the following-described areas... be reserved and set apart for the use of the Department of the Interior as a refuge and breeding ground ..."

"the airspace over the said territorial waters and island is hereby set apart and reserved as a naval airspace reservation for purposes of national defense"

"This order shall take effect ninety days after date hereof"

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