President Xi Jinping of China has ordered his armed forces to be ready to seize Taiwan by 2027. Though the United States maintains a policy of strategic ambiguity on how it would respond to an invasion, Republican and Democratic presidents alike have said that America would defend the island nation. The Pentagon has produced a classified, multiyear assessment that shows how such a conflict would play out: the Overmatch brief. The report is a comprehensive review of U.S. military power prepared by the Pentagon's Office of Net Assessment and delivered most recently to top White House officials in the last year. It catalogs China's ability to destroy American fighter planes, large ships and satellites, and identifies the U.S. military's supply chain choke points. Its details have not been previously reported.