Er, sorry. I made the last post sorta half awake. I forgot to make my point, haha.
Anyway, the point I was trying to make yesterday is that to the Imperium, the tools of war is vastly more important than the people. It's very easy to replace the men. The Imperium has incredible amounts of man power to draw upon. It's ability to manufacture new weapons is, relatively, limited.
Yeah i know soviet era way of thinking. regardless this has limits since tyranids among others have more bodies a lot more bodies than imperium and they use your bodies to make more of there bodies. something the imperium can't do that with its enemies.
New weapons and tactics will be needed and soon. a weapon is powerful but its paper weight with no one to use it.