[tritium]

  If the Cubans are following 
  an evolutionary path from 
  the device concealed in the 
  Great Seal in the 50's then...

That is the furthest idea from my conceptual model of what this all might be. I don't think any of this is accidental. I think deliberate harm is being done, and that willful animosity has permitted the rationale that U.S. officials represent a population of human test subjects, as expendable resources, for a weapon with unknown neurological effects to be used against aggressive enemy combatants.

I think it's a directed energy weapon.

I think kinetic energy is being applied in a novel way, such that patterns of constructive interference are created by alligning harmonic waveforms so that their intersection creates high-signal regions with deleterious effects for biological tissue within said region.

Much in the way electromagnetic directed-energy-weapons can be combined and focused to achieve greater effect, either ultrasound or infra-sound is being used as a kinetic analog with similar results. This is not "The Brown Sound" but something worse.