Anybody see Transformers 2?
They featured something similar in TF2. That one looked cooler and had a balistics velocity of mach 7. Also was scaled a bit bigger as it was mounted on a Navy destroyer.
I personally like this idea. Functionality wise, it's like a sniper rifle the size of a mortar cannon. Take out missles by "sniping" them out of the air.
The US doesn't have that many naval threats warrenting a gun of this caliber at the moment, but a ship-mounted model would be useful for taking out close to shore targets on enemy soil. Just have an on-site spotter equiped with a laser target designator to spot targets. Fires right through buildings. Want that tank gone? It's gone!
I noticed that this prototype model is flatbed mounted. I'm wondering what kind of power requirements it has and what the reload/coodown cycle is like. It'd be awesome to be able to rapid fire this thing. Having a portable truck-mounted production version that could run off a Diesel generator would be nice too.