I still find it very annoying this repeating of the "destroy Texas/France" bit. There is no practical 10xMIRV weapon that can do that.
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Also a case of diminishing returns? 5mt will suffice. 40mt too heavy & will just burn already scorched earth. Meant as counter to Thaad?
The two main reasons for pursuing very high yields were a) low accuracy of missiles (largely solved by later work) and b) thermal effects
