(S (S (NP (BASENP (NNP Steve) (NNP Allen)) (PRN (COMMA ,) (BASENP (DT a) (NN pilot)) (COMMA ,))) (VP (VP (VP (VBD observed) (BASENP (DT the) (NN object))) (PP (IN from) (BASENP (DT the) (NN ground)))) (CC and) (VP (VP (VBD described) (BASENP (PRP it))) (PP (IN as) (S (VP (VBG being) (NP (BASENP (DT a) (NN half-mile)) (PP (IN with) (BASENP (JJ flashing) (NN strobe) (NNS lights)))))))))) (PERIOD .))