"So back to the question at hand: In urban terrain, what tactics would you use, given about three squads of mediocre US infantry supported by one squad of civillian malitia, to hold off constant harrassment by Spetznas led VDV Desantniki in near company strength?"
You sell out the radio team and information in the hope that the Soviets will let you live. Otherwise you fight house to house, blowing holes and retreating and bringing as many houses down on the Soviets as you can to cause casualties, all to buy time to destroy the info or get it off to Command, you can't win this situation.
Again, this is not meant as a criticism on the GM, it's a common trope in Twilight, the PCs get involved in a "one in a million" situation where they have, RESET, vital information, whatever and are hunted down by the authorities. I've seen it happen, commonly it's because the GM introduces a big ticket MCGUFFIN but then realises that the PCs can't survive without the plot protection a novelist gives his heroes.
In a gritty Twilight game, you can't give this to the PCs and eventually either everyone dies or it's an anti-climax where the PCs know they didn't survive by their own devices.
The moral of the story is don't introduce cinematic plots to gritty war stories.
On the other hand, in game, don't see it as a failure, go down with glory. That's how the French Foreign Legion got famous, embrace the hopeless situation, fight the good fight and die with your enemy's heart in your hand.
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