A common concept in the Left 4 Dead games is that the survivors are normal civilians. They don't have a lot of training in teamwork or tactics and they are not well equipped. In the WH40k universe, it's nearly impossible to find a civilian who hasn't had to fight for their life at some time. Also with the threat of demonic and xeno incursion always present, I'd imagine that there'd be a lot of emergency access gun lockers and saferooms.

So that means Xoey does not have power armor, I was thinking that her reason for being in the Hive-City is that she was visiting her friends and family one last time before joining the Sisterhood.

Finally, I think Imperial Safety/Propaganda Posters would be hilarious to see.