https://gizmodo.com/leaked-u-s-docs-say-crickets-not-weapons-likely-caus-1847777706
Mass hysteria. One of the wives actually recorded the sound of the weapon. (Hint, you cannot make an audio recording of microwaves or ultrasound)
And after the HAVANA act, victims of the death beam get medical retirement and a 187,000 lump sum. And suddenly half of the CIA/State female hypochondriacs were victims.
Havana syndrome was disproven years ago by competent engineering firms.
Sound waves (and moisture, and debris) in the air, are affected by ultrasound.
There are devices that can “see” that activity.