I've found a bug that you may wanna work out. If you save a template with 1 of any/all troop types and if you make a large amount of that type, let it train, and then load the template setting the troop(s) back down to 1 it actually saves all of the training onto the single troop making it incredibly strong. This can be abused to make an army of single troops that each have a power level that you could only achieve normally if you devoted your entire economy to that single type of troop. Combined it eliminates the need to actually think of what type of military units you should be training as well as makes the military need almost no pop or resource upkeep once you have performed the bug on each troop you have access to.