(S (S (S (BASENP (DT The) (NN helicopter)) (VP (VBD had) (VP (VP (VP (VBN been) (PP (IN in) (BASENP (NN formation)))) (PP (IN with) (NP (BASENP (NN two) (NNS transports)) (CC and) (BASENP (DT another) (NNP SuperCobra))))) (S (VP (TO to) (VP (VB practice) (BASENP (NN night) (NN flying)))))))) (COMMA ,) (SBAR (IN while) (S (BASENP (DT the) (NNP Coast) (NNP Guard) (NN plane)) (VP (VBD was) (VP (VP (VBG conducting) (BASENP (NN search) (CC and) (NN rescue))) (PP (IN for) (BASENP (JJ 50-year-old) (NN boater) (NNP David) (NNP Jines)))))))) (PERIOD .))