(S (S (S (BASENP (DT The) (NN two) (NNP OH-58) (NNP Kiowa) (NNPS Warriors)) (VP (VBD had) (VP (VP (VBN been) (PP (IN on) (BASENP (DT a) (NN mission)))) (PP (IN in) (BASENP (NNP Kirkuk)))))) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP they)) (VP (VP (VP (VBD were) (VP (VBN targeted))) (CC and) (VP (VP (VBD struck) (BASENP (DT each) (NN other))) (PP (IN during) (BASENP (JJ evasive) (NN action))))) (COMMA ,) (S (VP (VBG killing) (PP (BASENP (PDT all) (DT those)) (PP (IN on) (BASENP (NN board)))))))))) (PERIOD .))