The $X trillion missing from Pentagon funds is a meme that pops up every few years (new "journalists" discovering the same news and trying to fill their click quota?).

The money is not missing, just not tracked up to expected accounting standards

Article from 2013: https://www.reuters.com/article/us-usa-pentagon-waste-specia...

Article from 2002: https://www.cbsnews.com/news/the-war-on-waste/

And you can Google [missing trillions] to find an article on the topic from any given year.