U.S. Secretary of Defense Ashton B. Carter speaks with U.S. Air Force Lt. Gen. Jerry P. Martinez on Dec. 5, 2016 at Yokota Air Base, Japan. Carter stopped at Yokota during his travel to U.S. military instillations across the world, with plans to advance U.S. priorities including the rebalance to the Asia-Pacific region. (U.S. Air Force photo by Airman 1st Class Donald Hudson/Released)