US Vice President Mike Pence arrived on an unannounced visit to Afghanistan, becoming the most senior Trump administration official to visit troops fighting a 17-year-old conflict that has largely receded from US public view. <br/><br/>Flying secretly through the day and night on a standard unmarked US Air Force C-17, Pence corkscrewed into Bagram Airforce Base, where he thanked some of the roughly 15,000 US personnel still hoping to turn the tide of America's longest-ever war. <br/><br/>Pence's visit is designed to shift the spotlight back on personnel and their mission, however briefly, before Americans turn their focus to turkey lunches, festive cheer and contentious domestic politics. Pence's visit also included a perilous helicopter dash from Bagram into the heart of the capital Kabul to meet President Ashraf Ghani and Chief Executive Abdullah Abdullah, both of whom the United States is counting on to help rebuild this war-shattered country.