In the streams we have seen military ethos being divided into Empire modifiers (Rivalry, Alliance cost, Army damage) and POP modifiers (war happiness). If you integrate another species who are militaristic, but your empire are not, would all but the war happiness be entirely lost?
If so, army damage should be a POP modifier, so a puny science oriented race could enslave or integrate competent warriors into their fold.
If so, army damage should be a POP modifier, so a puny science oriented race could enslave or integrate competent warriors into their fold.