The Zumwalt has the potential to be a total monster. I was lucky enough to see one in harbor otw back to Boston from a trip I took to Maine (I ate like 10 lobsters through that trip and Maine wins)... anyway that mfer is nothing to fuck with. It can handle a rail gun and is super stealth.
As soon as railguns get involved, you KNOW this thing means business. Those things are hardcore, especially when they are big enough to need to be mounted on a destroyer.
Still, at 60 detachable marines each, that's still pretty formidable.