E-4B
An Air Force E-4B aircraft approaches Yokota Air Base, Japan, June 28, 2018, during Defense Secretary James N. Mattis's seventh trip to the Indo-Pacific region. Mattis is here to visit senior Japanese government leaders to reaffirm the importance of the U.S. -Japan Alliance and to discuss cooperation on a variety of regional security issues. (U.S. Air Force photo by Yasuo Osakabe)