SAN DIEGO (AP) - A high-ranking military leader has acknowledged that the mandatory anthrax vaccination for American troops can be potentially dangerous, The San Diego Union-Tribune reported Tuesday. Citing military documents, the paper reported Army Secretary Louis Caldera agreed in September the government would accept the burden of potential liability claims by service members against the vaccine's manufacturer. According to a memo signed by Caldera, the vaccine "involves unusually hazardous risks associated with the potential for adverse reactions in some recipients and the possibility that the desired immunological effect will not be obtained by all recipients.