evidence: A Breakdown of U.S. Military Spending in Afghanistan America’s own government watchdog says oversight of the money spent on military efforts in Afghanistan has been poor with hundreds of millions of dollars misspent and corruption rife The U.S. and NATO have promised to pay $4 billion a year until 2024 to finance Afghanistan’s military and security forces, which are struggling to contain an advancing Taliban. Already, the U.S. has spent nearly $89 billion over the past 20 years to build, equip and train Afghan forces.