(S (S (BASENP (JJ Several) (NNS helicopters)) (VP (VBD were) (VP (VP (VBN called) (PRT (RP in))) (PP (IN from) (NP (NP (BASENP (NNP Detroit)) (COMMA ,) (BASENP (NNP Michigan))) (CC and) (BASENP (NNP Traverse) (NNP City))))))) (PERIOD .))