1. When there are lower tier units that are idle, click the green arrow on the troop interface or the corresponding training building to promote them.
2. Units will be promoted to the highest train-able tier
3. Commandos and Mercenaries cannot be promoted
4. Promotion does not yield event points
5. In the barracks, the icons are used to differentiate between units, only the same type of units can be promoted
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Game Guide for Last Empire – War Z