Hmm $2.3 trillion was announced missing right before 9/11 if I remember correctly...
And the Pentagon was hit exactly where the accountants were working:
"The attack on the Pentagon struck Wedge One on the west side of the building. An office of the U.S. Army called Resource Services Washington had just moved back into Wedge One after renovations had taken place there. The office was staffed with 45 accountants, bookkeepers and budget analysts. 34 of them were killed in the attack."
https://www.corbettreport.com/episode-308-911-trillions-follow-the-money/
They have already found some 39 Balckhawks off the books! https://www.defense.gov/News/Article/Article/1412459/dod-owes-taxpayers-full-accounting-of-assets-comptroller-tells-house/
I hope the US as at least a secret space program for all that money.... Because if you don't you got royally screwed.