* At least 27 people killed in U.S. strikes so far * Experts question whether U.S. strikes are legal * Unclear whether US rescued survivors, if they are now in US custody * Head of U.S. Southern Command resigns, stoking concerns (Adds possibility that strike was not designed to leave survivors, details on U.S. campaign; paragraphs 2,3,7) By Phil Stewart WASHINGTON, Oct 16 (Reuters) – The U.S. military carried out a new strike on Thursday against a suspected drug vessel in the Caribbean, and in what is believed to be the first such case, there were survivors among the crew, a U.S. official told Reuters. The official, who spoke on condition of anonymity, did not offer additional details about the incident, which has not been previously reported, except to say that it was not clear that the s

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