Commentary The world is focused on the unfolding disaster in Afghanistan. That is, a disaster for American foreign policy and alliances, but a boon to U.S. adversaries, particularly the Chinese communist regime. What must it feel like to be a senior Taliban fighter who has defeated the “Great Satan” after two decades of fighting in the Afghan mountains and valleys? Ask a few geriatric veterans of the North Vietnamese Army or the handful of Vietcong who survived the 1968 Tet Offensive. They know that feeling, too. Black April for the South Vietnamese (i.e., the month in 1975 in which they lost their country to the communists) is a direct parallel with Black August in Afghanistan. And what must the Afghanis who have been fighting the Taliban over the last 20 years be thinking? What are their emotions? What will happen to those erstwhile allies of the United States and NATO …