Military Super-Soaker

The problem with any weapon system is the combination of mass and energy - nuclear weapons are "great" - small mass, big energy - but lots of side-effects. Bullets and bombs have the problem of being too heavy. The Nuclear Water Cannon (NWC) is a fission-powered ship that drives into hostile waters and uses its vast energy resources to "blast" water directly from the oceans onto hostile countries. Limitations are obviously how far you can blast water (unknown), but you could effectively hurricane an area with a salt water deluge (with associated environmental damage). Maybe it could work as a constant stream, or maybe you could shoot water "bombs" (as opposed to water balloons).