 FACT: The commander of the destroyer orders the chief to secure the  enigma encoding machine and all documents. The commander of a U.S.  destroyer during WW II would not know about the enigma encoding  machine, as the allies knowledge of enigma was one of the biggest  secrets of the war. However, even in the unlikely event that the  commander of the U.S. destroyer was privy to this secret, he  certainly would not have mentioned it by name over the radio.