When we think of using the supernatural as a weapon of war, our brains are most likely going to conjure up images of the Oracle of Delphi and soothsayers from Ancient Egypt. Those were the beginnings, not the end.
After World War II, it was made public knowledge that the Nazis were attempting to using supernatural means to win the war. Hitler really was scouring the world looking for mystic relics, a la Indiana Jones style. The Soviet Union attempted to use psychic warfare. So did the US and the Great Britain. There is evidence to suggest that Winston Churchill even consulted with Aleister Crowley for help.
However, that’s also not where the story ends. The US was experimenting with remote viewing and other psychokinesis powers long after WWII. It didn’t help much, not really. We still lost Vietnam, despite our best ground and psychic efforts. It’s possible we are still toying with today.
A UFO sighting might have influenced the design of the B-2 (stealth bomber) as well as the SR-71 Blackbird spy plane. Clarence Johnson did report seeing a UFO before he began designing stealth technology that would be used in both the SR-71 and the B-2. And conspiracy theories aside, stealth technology was a major advance in air conflict.
We know the Nazis employed occultists and even a secret society called the Vril Society (the Vril might be the same or is at least, very similar to the Akashic Records). Rumors persisted that the US was attempting to access the Akashic Records (the theory that universal knowledge is available, in the form of energy that can be accessed by psychic means).
So, from ancient times to modern day, militaries have been interested in psychic phenomenon to win wars. Talk about walking on the slightly weird side… Imagine how much damage a league of psychics could do on a far away place. It would be an army to be feared and possibly, unstoppable.
Thankfully, no one seems to have mastered these super weapons. It would be very, very bad. (there would also be no need for a couple of alphabet agencies)