(S (S (PP (IN As) (BASENP (DT a) (NN precaution))) (COMMA ,) (S (S (BASENP (DT the) (NNP MoD)) (VP (VBZ is) (VP (VBG restricting) (NP (BASENP (PRPD its) (NN use)) (PP (IN on) (BASENP (JJ other) (NNS boats))))))) (SBAR (IN until) (S (BASENP (NN safety) (NNS checks)) (VP (VBP have) (VP (VBN been) (VP (VBN carried) (PRT (RP out))))))))) (PERIOD .))