(CNN)America's chaotic, humiliating -- yet, at times, heroic -- final retreat from its defeat in Afghanistan will resonate for years after the last military jet lifted off from Kabul at 11:59 p.m. local time on Monday, ending the country's longest war. The departing troops left somewhere between 100 and 250 Americans, tens of thousands of Afghans entitled to protection from former US comrades and an entire nation to their fates under fundamentalist Taliban rule -- along with an even more extreme faction of ISIS. For them, the "forever war" is far from over. But any sense that the US is...