US Pentagon is missing 10 TRILLION Dollars?

Current estimates clock the Pentagons missing cash from 8-10 trillion. Where did it go? What is it being used for?

The REAL Reason the Pentagon is missing 10 TRILLION Dollars.

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SOURCES:
http://www.pagetutor.com/trillion/index.html
https://www.globalresearch.ca/the-pentagon-black-budget-21-trillion-dollars-gone-missing/5623553
https://en.wikipedia.org/wiki/Special_access_program
https://isgp-studies.com/USAPs#secrecy-classification-systems
http://area51looseends.blogspot.co.uk/2009/05/bob-lazar-true-or-false.html
https://en.wikipedia.org/wiki/List_of_reported_UFO_sightings