We need a six hundred ship Navy to uphold our treaty obligations. This allows us to control the seas. Naval deployments are tough on people and equipment. You need the ability to rotate ships into maintenance windows and give the crews a break. Pluse we need the ability to replace combat losses. Three hundred fifty ships is not enough.
Against who?
Three hundred fifty ships is not enough.
Well then how do you know we don't need seven hundred? Or eight hundred?