Your biggest threat was never the aircraft. Nothing ever took off from either carrier of the task force. Even then, for aircraft moving upwards of Mach 2, you'll need something more than flak for that. Railguns would have to have a near perfect timing to actually hit such a craft. That fool has no clue what he speaks of, militarily. I have no space craft, second off. We are strictly in-orbit. And i can offer you much cheaper bulk iron dome systems and AA systems to defend against missiles than he can. The base model Phalanx close-in weapons system would be much cheaper. It's a 25mm rotary cannon with onboard radar and tracking systems. Aside from that, a general scrambler would be easily installed on computer and radar systems. As far as higher-caliber weaponry for men on the ground, I'd suggest the HCAR, a .30.06 battle rifle, the modern variant of the BAR. Cheap and made of polymer, the weapon is capable of being modified into several different systems all for under $2000 per unit.