Nuking a Soviet ICBM site in '64 Nikita Khrushchev still had nuke missiles in Cuba when this flick was released. Now, there are hypersonic nuke bombers, waiting to be ordered deep into Russia to deliver their 20MT payloads, stealth B70s, Mach 5+. Yes, solid state nuclear gas generating powered rockets, delivering the thrust necessary for those velocities. What is old is new again. Geopolymer ceramics, able to withstand the intense heat of friction, modern ancient stone !