sentences:  On January 14, 2005, CHS helped to host Atlantic Storm, a table-top smallpox bioterrorism simulation.On May 15, 2018, the Center hosted Clade X, a day-long pandemic tabletop exercise that simulated a series of National Security Council–convened meetings of 10 US government leaders, played by individuals prominent in the fields of national security or epidemic response.Drawing from actual events, Clade X identified important policy issues and preparedness challenges that could be solved with sufficient political will and attention.