Clarke reported that they were asking the President for authority to shoot down aircraft.
( Clarke ( ( reported ( that ( they ( were ( ( asking ( ( the President ) ( for authority ) ) ) ( to ( ( shoot down ) aircraft ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Clarke)) (VP (VBD reported) (SBAR (IN that) (S (NP (PRP they)) (VP (VBD were) (VP (VBG asking) (NP (NP (DT the) (NNP President)) (PP (IN for) (NP (NN authority)))) (S (VP (TO to) (VP (VB shoot) (PRT (RP down)) (NP (NN aircraft)))))))))) (. .)))
They requested authority to use EMPs on the aircraft.
( They ( ( ( requested authority ) ( to ( use ( EMPs ( on ( the aircraft ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD requested) (NP (NN authority)) (S (VP (TO to) (VP (VB use) (NP (NP (NNP EMPs)) (PP (IN on) (NP (DT the) (NN aircraft)))))))) (. .)))