Troop conversion

When you change race, you can convert existing troops (at a conversion rate) from your previous race to your new race. Just bear in mind that only the troops of your current race get the benefits from your research. If you find you are short on a particular rare resource, you can even change race, build the related troop type (see table) that uses a different resource, then swap back to your original race and convert the troops. You could even build them, convert back to your race of choice, and disband the new troops (at a 50% loss) to generate the resource you're short of.