ventuswings, thanks!
Found that plasma missiles are replacing alenium ones, and if you managed research plasma explosives before alenium you are screwed. After alenium research completed all missiles (starting tier) have been replaced with plasma ones, which is okay, but all my newly crafted foxtrots have alenium torps, which is not okay. I guess I should create a copy of plasma explosives research to fix this (or buff alenium torps ). Same stuff (probably) with MAG weaponry. I have accidentally skipped all tiers and started researching MAGs.
C4 is truly epic! During base defence two soldiers rushed to entry point, one throwed C4, other smoke grenade to explode it instantly.
Which weapon is good against omega vipers? I've encountered first one during my second mission, sacrificed 4 soldiers to lure it from crashed scout (heavy one) while other 3 occupied it. Does their smoke dissipate with time? Not disappeared even after 10 turns.