(S (S (NP (BASENP (NNS Replacements)) (PP (IN for) (BASENP (DT the) (JJR smaller) (JJ nuclear-powered) (NN w) (NN :) (NN attack) (NNS submarines)))) (VP (VP (VBP are) (PP (IN under) (BASENP (NN construction)))) (CC and) (VP (MD will) (VP (VB be) (VP (VBN armed) (PP (IN with) (BASENP (NNP Tomahawk) (NN missile) (JJ tactical) (NN missile) (NNS systems)))))))) (PERIOD .))