The Vietnam War, pic: circa 1960’s, A North Vietnamese missile battery preparing for action, In the late 1960’s and 1970’s United States air raids over the country were met by stiff resistance from communist air defences

The Vietnam War, pic: circa 1960’s, A North Vietnamese missile battery preparing for action, In the late 1960’s and 1970’s United States air raids over the country were met by stiff resistance from communist air defences (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)