(S (S (NP (BASENP (DT The) (NNP U.S.) (JJ military) (NN headquarters)) (PP (IN in) (BASENP (NNP Baghdad)))) (VP (VBZ has) (VP (VBN confirmed) (SBAR (S (BASENP (DT the) (NN attack)) (VP (VBD took) (BASENP (NN place)))))))) (PERIOD .))