namelessfly wrote:You are able to use a CIWS because the population is in hardened shelters able to withstand about 50psi overpressure. I don't think people would be vulnerable to a 30mm round falling at terminal velocity. Given the relative risk of a one megaton nuke verses a 30 mm round, I don't think that they would worry about the 30 mm round.
The Army used this in Iraq and Afghanistan.