The Taliban clashed with Iranian border guards over the weekend, and it used American equipment to do it. Videos of the skirmish are all over social media, and they show Afghanistan fighters using a mix of old Soviet gear and U.S. weapons from the War on Terror. On Telegram, videos from the advocacy group HalVash showed U.S. armored Humvees rolling down a road. One dramatic video ... showed a Humvee with an M240 machine gun in the back. Taken from the point of view of the man behind the gun, the shot lingers on the spent ammunition littering the top of the Humvee. According to the Special Inspector General for Afghanistan Reconstruction (SIGAR), a U.S. agency that tracked waste, fraud, and abuse in Afghanistan, America spent around $18.6 billion equipping the Afghan National. Much of that equipment is now in the hands of the Taliban. The Pentagon has said it left behind about $7.12 billion worth of military equipment, and it's had a hard time keeping track of it all in the wake of its withdrawal. The U.S. would frequently ship guns and equipment into the country only to have it go missing later. Shipping containers filled with small arms would sit unattended for years. The Taliban has much of it now. After the collapse, a Taliban official told AL Jazeera that it had taken more than 300,000 light arms, 26,000 heavy weapons, and around 61,000 military vehicles when it took over the country. He said the plan was to use these weapons and the Soviet-era armor to create a "grand army."