The Last War (1961) IMDb
Seen in 2017.
Nuclear exchange between two future military alliances on Earth.
The miniature effects work is terrible, the uniforms are as goofy as I’d expect from the super sentai of the next decade, and the male lead of the middle generation (the chauffeur) is bad comic relief. The last half hour is watchable, but does nothing particularly clever with the nuclear apocalypse. The tense Japanese cabinet reminded me of Japan’s Longest Day (1967); both have Ryū Chishū; in this one, Ryū gets to represent graceful surrender to the end of the world, instead of merely stepping down to give room to postwar leaders.