One thing Im really interested in is the guided "smart" round for the 5-inch, 76mm, and 56mm Naval guns that are standard on most every US warship. These guided projectiles have the potential to be able to shoot down hyper-sonic missiles and conventional cruise missiles for $50-25K a round (perhaps less) as opposed to over 4 million dollars per SM-6 fired. Better yet---they are smaller than missiles---meaning the typical naval warship could carry 500 or more of these guided shells to augment their anti-aircraft/missile defenses. A vessel with 30 to 90+ VLS tubes and another 500 "smart" shells would be very difficult to overwhelm with a missile attack.

The typical navy 5 inch gun can fire 20 rounds a minute. A modern 76mm naval gun can fire around 80 rounds per minute. A modern 56mm naval gun can fire over 200 rounds a minute. Even at hyper sonic speeds, a naval guns with a 6-15 mile effective range could get off numerous defensive rounds against an incoming wave of missiles. Its the kind of cheap innovation that potentially can render billions in enemy weapons largely worthless against defended targets.