(S (S (BASENP (NN Two) (JJ Canadian) (NN CF-18) (NN fighter) (NNS jets)) (VP (VBD had) (VP (VP (VP (VBN taken) (PRT (RP off))) (PP (IN from) (NP (BASENP (DT a) (NN military) (NN base)) (PP (IN on) (BASENP (NNP Vancouver) (NNP Island)))))) (S (VP (TO to) (VP (VP (VB intercept) (BASENP (DT the) (NN plane))) (PP (IN after) (NP (BASENP (DT the) (NN pilot) (POS 's)) (NN alert))))))))) (PERIOD .))