I knew about MC soldiers being able to fire unresearched alien weapons. I used to do alien base "smash 'n grabs" to get points, weapons, $ etc, but one time the base I encountered was Sectoids. My team managed to kill a few of the bugs, but the Cyberdiscs were especially vicious so I decided to abort and try again some other time. One of my soldiers dropped everything to go downstairs and ferry a dead Sectoid carrying a Heavy Plasma back to the green room. Unfortunately he was MC'd and over the course of a few rounds proceeded to kill nearly a quarter my squad who were trying to huff it back to the room to abort. Lesson learned: always drop alien weapons in-between turns.
Knew about the second one also from my PSX playing days. Ethereals can really mess up a mission quick, especially when you are running a lean ship with only 4 soldiers. Two soldiers were killed during the first round from lucky shots (forgot to deploy smoke), and the next round MC attacks started. Lesson learned: if you are dealing with Ethereals, you need to kill as many as you can every round as quickly as possible.
My X-COM Patch Kit For UFO Defense | Emergency XCOM Meeting spoof on YouTube
Zombie: Empirical data's your only man, when formulating a research plan.
A soldier's death is never in vain if it makes the formula more plain.
A few dozen make a better case for refining that third decimal place.
They call me Zombie because I don't sleep, as I slowly struggle to climb this heap,
of corpses, data points, and trials, but from the top - I'll see for miles!