The Pentagon announced today that U.S. Defense Secretary Ashton B. Carter landed in Kabul early Saturday on his inaugural overseas trip as defense secretary to assess the progress of the war in Afghanistan and review possible changes to the timetable for withdrawing all U.S. troops from the country. During a planned two-day visit, Carter is scheduled to meet with Afghan President Ashraf Ghani and U.S. military commanders, as well as to visit some of the 10,600 U.S. troops remaining in the country.