It's literally on their own military website

"Weather Modification: The Ultimate Weapon"

https://apps.dtic.mil/sti/pdfs/ADA283033.pdf

The link is temperamental... do a search with those words the Military have researched and written about it a lot

Or try here:

https://apps.dtic.mil/sti/citations/ADA283033

“Military weather modification is not a fantasy-it is a fact.”