probably he means not ones USA can export (as in, non nuclear) like this https://en.wikipedia.org/wiki/Barbel-class_submarine https://en.wikipedia.org/wiki/Barb

probably he means not ones USA can export (as in, non nuclear) like this https://en.wikipedia.org/wiki/Barbel-class_submarine https://en.wikipedia.org/wiki/Barbel-class_submarine