(S (S (NP (BASENP (NNP Commander) (NNP Leroy) (NNP Chiao)) (CC and) (BASENP (NNP Flight) (NNP Engineer) (NNP Salizhan) (NNP Sharipov))) (VP (VBP have) (VP (ADVP (RB just)) (VP (VBN completed) (NP (NP (BASENP (PRPD their) (NN mission) (POS 's)) (BASENP (JJ first) (NN space) (NN walk))) (PP (IN aboard) (BASENP (DT the) (NNP International) (NNP Space) (NNP Station)))))))) (PERIOD .))