Pentagon Boss Makes First Trip to Asia, Looks to Reassure Allies on North Korea

Joint Chiefs Chairman Gen. Joseph Dunford greets Defense Secretary Jim Mattis at the Pentagon on Jan. 21, 2107. By visiting Japan and South Korea on his first official overseas trip, Mattis is seeking to reinforce key alliances after President Donald Trump’s campaign-trail complaints that defense treaties disadvantaged the United States. AP Photo/Alex Brandon, File

US President Donald Trump in the Oval Office of the White House in Washington on Jan. 28, 2017. MANDEL NGAN/AFP/Getty Images