“‘Directed energy is more than just big lasers, Griffin said. ‘That’s important. High-powered microwave approaches can effect an electronics kill. The same with the neutral particle beam systems we explored briefly in the 1990s’ for use in space-based anti-missile systems. Such weapons can be ‘useful in a variety of environments’ and have the ‘advantage of being non-attributable,’ meaning that it can be hard to pin an attack with a particle weapon on any particular culprit since it leaves no evidence behind of who or even what did the damage.”
Source: Pentagon’s New Arms-Research Chief Eyes Space-Based Ray Guns – Defense One