[contentcards url=”https://www.forbes.com/sites/adamandrzejewski/2021/08/23/staggering-costs–us-military-equipment-left-behind-in-afghanistan/?sh=6a3570c741db” target=”_blank”] By Adam Andrzejewski The U.S. provided an estimated $83 billion worth of training and equipment to Afghan security forces since 2001. This year,…