You bring 10 troopers.
You build another 20 troopers.
You now have 30 troopers.
You lose 15 troopers.
You end the fight with 15 troopers.
Trooper survival rate of 50%.
Now that percentage is placed on the units you brought: 50% of 10 tanks = 5 tanks left on the (turn-based) strategy map.
That's an interesting way of doing it, definitely harder to game than most approaches but not impossible. For instance, it may be profitable to intentionally draw out a fight (after having pinned down the enemy so they can't effectively fight back) in order to produce additional units and lower your casualty rate.
Extra note: There is a survival rate per unit type. So you can lose all your troopers, keep half your hunters and have zero casualties on your juggernauts.
Oh, this one looks interesting. For unit-types that have a high casualty rate, it would make a lot of sense to bring few (if any) from strategy mode and build lots of them in RTS mode. Because their casualties in RTS would inflict relatively few casualties in strategy mode, they can be used in a much more disposable manner.
