> It's surprising how many systems there are (Russian, French, British, US, Chinese, Indian etc) and how rarely anyone dares to actually do a public test... Th

> It's surprising how many systems there are (Russian, French, British, US, Chinese, Indian etc) and how rarely anyone dares to actually do a public test... The stakes of getting this wrong are incredibly high. Perhaps all of these systems are simple posturing tools, incapable of providing real protection if called upon. They provide comfort to the population, and doubt in their enemies. I think it's just as likely that these systems work to some degree, but demonstrating them would provide the enemy with quantifiable data that can use to help circumvent the protection.