Operation Rolling Thunder was the campaign that was meant to keep South Vietnam secure, and dissuade the North from arming and supplying the Viet Cong. It pitted the world's strongest air forces against the MiGs and missiles of a small Soviet client state. But the US airmen who flew Rolling Thunder missions were crippled by a badly thought-out strategy, rampant political interference in operational matters, and aircraft optimised for Cold War nuclear strikes rather than conventional warfare.