Personally, I'd prefer an all male army. Not because I don't think women are capable (I know quite a few who are much more capable than me), but because someone needs to "guard the home front".
Given current advances in B&C technology (biological and chemical), it's possible to produce something that sterilizes rather than kills. If everyone goes off to fight and someone uses something like this, the end result becomes a loosing senario.
Of course, that's just my opinion.![]()
The Imperial Army is a professional army not a mass army. The Emperor prefers to keep it that way. Never know whats going to happen, if the darned peasants get into politics and the best way to keep them out of politics is to keep them out of war.
So there will always be someone keeping the home-fires burning.
In canon the Imperial Marines are legally unisex which says nothing about effects of local custom. As Aslan marines have segregated units they are presumably all male.The army varies from regiment to regiment.
As for MTU it takes place in a culture that is just outside the Imperium and I make it the way I want, and no it's not PC.