Adm. Phil Davidson, head of U.S. Indo-Pacific Command, wants an Aegis Ashore missile defense system on Guam by 2026 to defend the U.S. territory against advancing ballistic and cruise missile threats, arguing the combination of land- and sea-based missile defenses currently deployed there are limited to protecting one side of the island only and insufficient to provide 360-degree defense from China's ships and aircraft. Davidson, who advised Congress in March that his No. 1 unfunded priority in FY-21 is a...