This is a terrifying weapon to me, because it's specifically designed to destroy only the people and organic life so the infrastructure can be reused.
Really, bombarding things with neutrons is not what you want to do if you want to re-use something. Some elements become radioactive when they absorb a neutron and if if you want to re-use that infrastructure you'd probably be better off letting it take some blast and then repairing it.
After you!
But it seems to had another use. The W66 warhead has been used in the Sprint anti ballistic missile, to intercept and destroy ICBM.
Future archeologists.