Story highlights Back in 2004, a US-based company also made a prototype of such a weapon for the marine corps According to leading experts in the field, in recent years portable microwave weapons with the capability to cause the mysterious series of “Havana Syndrome” brain injuries in US diplomats and spies have been developed by several countries. Back in 2004, a US-based company also made a prototype of such a weapon for the marine corps. Codenamed Medusa, the weapon was small enough to fit in a car and temporarily incapacitate the target, but “with a low probability of fatality or permanent injury”.