(S (S (PP (JJ Due) (PP (TO to) (NP (BASENP (DT the) (NN time)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (VP (VBN passed) (PP (IN since) (NP (BASENP (DT the) (JJ first) (NN wave)) (PP (IN of) (BASENP (NNS marines)))))))))))) (COMMA ,) (S (BASENP (DT the) (JJ second) (NN line)) (VP (VBD assumed) (SBAR (IN that) (S (BASENP (DT any) (NNS buildings)) (VP (MD could) (VP (VB have) (VP (VBN been) (VP (VBN re-occupied) (PP (IN by) (BASENP (NNS insurgents)))))))))))) (PERIOD .))