(S (S (S (S (BASENP (QP (RB Over) (NN 800)) (NNS firefighters)) (VP (VBP are) (VP (ADVP (RB now)) (VP (VP (VBG tackling) (BASENP (DT the) (NNP Crown) (NNP Fire))) (PP (IN on) (BASENP (DT the) (NN ground))))))) (COMMA ,) (S (NP (BASENP (NNP Boeing) (NNP 747)) (CC and) (BASENP (NNP McDonnell) (NNP Douglas) (NNP DC-10) (JJ fixed-wing) (NN aircraft))) (VP (VBP have) (VP (VP (VBN taken) (PP (TO to) (BASENP (DT the) (NNS skies)))) (S (VP (TO to) (VP (VP (VB drop) (NP (BASENP (JJ Phos-Chek) (NN slurry)) (PRN (LRB -LRB-) (NP (BASENP (DT a) (JJ red) (JJ powdery) (NN fire) (NN retardant)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ is) (NP (BASENP (DT a) (NN mixture)) (PP (IN of) (NP (ADVP (RB mostly)) (BASENP (NN water) (CC and) (NN fertilizer)))))) (CONJP (COMMA ,) (CC and)) (VP (VP (VBZ does) (RB n't)) (VP (VB evaporate))))))) (RRB -RRB-)))) (PP (IN on) (BASENP (DT the) (NN fire)))))))))) (CONJP (COMMA ,) (CC and)) (S (NP (BASENP (VBN modified) (NNP Sikorsky) (NN UH-60) (NNP Black) (NNP Hawk) (NNS helicopters)) (VP (VBN known) (PP (IN as) (QT (DQL ``) (BASENP (NNP Firehawks)) (DQR ''))))) (VP (VBP are) (VP (VBG making) (BASENP (NNS water-drops)))))) (PERIOD .))