Eleven years after the United States began building an air force for Afghanistan at a cost now nearing $8 billion, it remains a frustrating work in progress, with no end in sight. Some aviation experts say the Afghans will rely on American maintenance and other support for years, reported NYT. According to the report, for years beginning with the Obama administration, part of the American exit strategy has been to build and train the Afghan military — including the air force — to fight the insurgents on its own. That strategy appeared to be undermined in December when Mr. Trump was said to have ordered preparations for half the 14,000 American troops in Afghanistan to come home. At the same time, American military officials have been warning that the Afghans remain dangerously unprepared.