In particular, for the ships, they need a replacement for Phalanx. Basically, imagine a gattling gun with these at say 8 megajoules rather than 64 mj that this uses. Simply fire small rounds to take out an incoming missile or plane that comes within 20 miles.
In addition, the house republicans need to allow the DOD to stop production on the M1A2. They want to upgrade the system so that it will have better protection from IEDs, but also so that the main gun can be replaced with this. A tank that can shot shells like this just 10 miles, but in particular, can do it with 3 second bursts, would be a major change in warfare.