RAMSTEIN AIR BASE, Germany — Sixteen-year-old Dunya Walizada last saw her parents at the gate of Kabul’s airport.It was a seething crush of people. Support our journalism.... I don’t have any information.” Hers is just one in a sea of stories here that underscore the complications of the mammoth effort to extract both Afghans at risk and Americans who were stranded in Kabul and get them to safety.... Some of the Afghans worry that they lack the documentation to make it to the United States. St