If infantry freeze to death while playing as the Russians in 2, you may hear the commander complain that if your troops freeze to death, they cannot die fighting the enemy, pretty much in those exact words. Apparently, even the Red Army has limits.
Selecting a Conscript squad on a winter map occasionally has them respond "... I think I have snow in my pants." said quietly, as if you've interrupted him talking to himself or his squadmates.
In 2, the tutorial video narrator delivers this gem in the Cover and Flanking Tutorial video:
"You will undoubtedly hear a lot of F-words on the battlefield, but the most important one is Flank."