Northrop Grumman has expanded its capabilities into the heavy-class of launch vehicles with its new OmegA rocket.
The Tactical Nuke Cannon
A tactical nuclear weapon is normally deployed from a nuclear cannon (atomic cannon/nuclear artillery). These pieces were developed in the 1950s, and fired quite frequently in Nevada at atomic test sites. As Napoleon may have once said, "Strategy is out of cannon range, tactics is within cannon range."