10 Alleged Secret Weapons Of The US Military 1 Directed Energy Weapons. ... 2 Long Range Acoustic Devices. ... 3 Low-Frequency Microwave Mind ... 4 Heart Attack Guns. ... 5 Magneto Hydrodynamic Explosi ... 6 Biological Weaponry. ... 7 Subliminal Messaging. ... 8 Flying Aircraft Carriers. ... 9 Project Thor. ... 10 HAARP. Photo credit: uaf. ...