Board Thread:Warhammer 40k General Discussion/@comment-7123746-20130718083413

Is there a truly a force in the 40k Universe that have not only the numbers, but the ability to replace their loses well enough that they could be considered effectively immune to attrition?

Obviously Tyranids and Orks spring to mind.... What about good ol' Imperial Guard? What about the rest? Which are destined to run out of warriors and which truly have time on their side? And if it's all just a numbers game, then who has the biggest number? 