The last US troops have left Bagram Air Base, according to a US defense official, marking the end of the American presence at the sprawling compound that became the center of military power in Afghanistan, writes CNN.

The full withdrawal of US troops from the country is not complete yet but expected very soon.

Nearly two decades after the first American troops arrived at Bagram and helped take control of the field after the 9/11 attacks, the transfer of the field to the Afghan military proceeded without fanfare, a hushed finale that portends the imminent conclusion of America"s longest war.