Factbox-Bagram: the Soviet-built air strip that became America's main Afghan base

An Afghan National Army soldier stands guard at a check post near Bagram U.S. air base, on the day the last of American troops vacated it, Parwan province, Afghanistan July 2, 2021. REUTERS/Mohammad Ismail

KABUL (Reuters) - The departure of U.S. troops from Afghanistan's Bagram air base on Friday marks the end of a 20-year war.

Here are some facts about the Soviet-built air strip, which has served as the main base for two super powers that waged campaigns to subdue Islamist insurgents in Afghanistan.