So, if you are playing for allies and you want to get PSI-Corp
Trooper, then train a spy, lead it to Psychic Beacon, and
infotrate it. When that girl would say that it is infotrated,
click infantry button, and build your PSI-Corp Trooper.
To make your Troopers be born with promotions, lead spyes to
Barracks, War Factories, Tech Centeres, Naval Yards e.t.c.
What does Cloning Vats do ?
I had such question once. I built it and ... POOF! When I trained
one Yuriy, I found another one inside! Don't make your Troopers go
into the Clonong Vats building. This option is only if you have
captured enemy Tanya, for example. You should get a "Train Tanya"
Wait, and maybe you'll se a "What does Ore Purifier do?"
Good Bye, YO!