(S (S (ADVP (RB However)) (COMMA ,) (S (BASENP (NNP Army) (NNS officials)) (VP (VBP believe) (SBAR (S (BASENP (DT some) (NN ammunition)) (VP (ADVP (RB even)) (VP (VBZ dates) (PP (ADVP (RB back) (RB further)) (PP (TO to) (BASENP (NN 1962))))))))))) (PERIOD .))