Yemen has posed a concern as a potential terrorist safe haven for some time, and the United States will continue to work with its government to prevent that from happening, the chairman of the Joint Chiefs of Staff said at the Naval War College here today. Navy Adm. Mike Mullen said the U.S. military has no plan to conduct combat operations in Yemen, nor does the Yemeni government want U.S. combat forces in the country. Rather, he said, the U.S. military will help the Yemeni military with equipment and training. U.S. military officials have been concerned about the country long...