The U.S. military is planning to roll out a Defense of Guam capability that effectively identifies from Army and Navy radar a single track for air-breathing threats but not yet adversary ballistic and hypersonic missiles, even as top brass assess that incoming raids in a conflict with China could be in the "hundreds" or "thousands." Missile Defense Agency Director Lt. Gen. Heath Collins said a prototype integrated air and missile defense architecture developed by his agency called the Joint Track...