  The paper begins with a general introduction and update to Fourth Generation
Nuclear Weapons (FGNW), and then addresses some particularly important military
aspects on which there has been only limited public discussion so far. These
aspects concern the unique military characteristics of FGNWs which make them
radically different from both nuclear weapons based on previous-generation
nuclear-explosives and from conventional weapons based on chemical-explosives:
yields in the 1 to 100 tons range, greatly enhanced coupling to targets,
possibility to drive powerful shaped-charge jets and forged fragments, enhanced
prompt radiation effects, reduced collateral damage and residual radioactivity,
etc.

Physics and Society