Take over a hospital, and build a Cloning Vat (if you dont have one take over the NME base). Get an expensive unit or one that takes a long time to make. Get a machine gunner and shoot the unit. Then tell the unit to go repair itsself in the hospital... tadaa! Look at the cloning vat: another unit! This only works for people and I'm not sure if it will work with Yuri/Yuri Prime.