A very big hole with little oversight.
To put any blame on Trump is it misplaced.Remember Afganistan cost US taxpayer 320mio per day for 20y so best not ruffle any feathers if you want a cushy job after retirement.
That was just one hole in a sieve, US is bleeding $$$ in 80+ countries around the world, no one is going broke in MIC because Afghanistan draws to a close. And i wouldn't be too sure that there will not be some continued presence in Afghanistan as well and billions continuing to flow down the drain.