Twilight:1950?
"We had them on the ropes. That's what the generals said, that's what the newsreels said. The Germans were about to crumble, the Japanese were falling back. It would all be over by Christmas. No, honest - I actually heard some general say that. And I wondered why the old top sergent laughed when he heard... But we crossed the Rhine, and all Hell broke loose. London, gone. Paris, gone. New York, San Fran, D.C... Wichita, Kansas - gone. How the hell they reached Kansas, i've never heard, but it went too. Gone in a flash. And they were lucky, too - at least they didn't go like Moscow went. Whatever fury the Dying Reich unleashed on the West, the East got it threefold. Ten years gone and there are places you still don't dare walk, and hope to live."
"So what could we do? Some guys wanted to quit. But we'd come here to wipe a terrible evil from the planet - how could we just stop when they'd showed themselves to be more evil than we'd imagined? So we fought. And the surviviing boffins, the scientists who gathered in the secret enclaves the Reich couldn't reach, or missed, gave us the tools to do the job. Strange weapons, astounding weapons... Terrifying weapons. Stuff you can't imagine - and shouldn't want to. But we had to use 'em - or they'd be used against us. 'Cause the Axis' scientists hid and lived and kept on working too - and they don't hesitate a second when they have a bright, sneaky, evil idea..."