(S (S (NP (BASENP (NNS Officers)) (UCP (PP (IN in) (NP (NP (BASENP (JJ full) (NN body) (NN armor)) (COMMA ,) (BASENP (NNS helmets))) (CC and) (BASENP (NN gas) (NNS masks)))) (CC and) (VP (VBN armed) (PP (IN with) (NP (BASENP (NNS shotguns)) (CC and) (BASENP (NN assault) (NNS rifles))))))) (VP (VBD were) (VP (VBN seen) (S (VP (VBG moving) (PRT (RP in))))))) (PERIOD .))