Dry Tortugas, Fla. Executive order [providing that Tortugas, Fla., Great Harbor, Culebra, Guantanamo naval station, Cuba, Pearl Harbor, Hawaii, Guam, Subic Bay, P. I., and Kiska, Aleutian Islands, tire not and shall not be made sub-ports of entry for foreign vessels of commerce, nor shall said harbors be visited by any commercial or privately owned vessel of foreign registry or by and foreign national vessel except by authority of Navy Department].