Heal Price Reduction:
In cases emergency cases where your units are at the mercy of the flesh feeding hordes of Zombies, you have the option to instantly heal them. Although readily available from the very start of the game, healing your units can be quite expensive and easily drain your resources. This upgrade tree basically cuts that cost by certain percentage as you unlock them.
Heal Price -20%
In emergency situations recruits can be healed almost immediately by injection of T7000 hormone. Each injection cost some money. This upgrade reduces injection cost by 20%.
Heal Price -40%
In emergency situations recruits can be healed almost immediately by injection of T7000 hormone. Each injection cost some money. This upgrade reduces injection cost by 40%.
Heal Price -60%
In emergency situations recruits can be healed almost immediately by injection of T7000 hormone. Each injection cost some money. This upgrade reduces injection cost by 60%.