No such thing as a stupid question,
@caliban22. Both you and
@Oak7ree have asked about the
Edelweiss, and I think it is reasonable to assume that young soldiers looking to prove themselves would climb extreme peaks to grab the flower and prove themselves to both themselves and the God-Emperor.
The culture of the regiment, as you rightly pointed out, is heavily Germanic - our battle cant, our dress, certain customs etc - the regiment as a whole is recruited from all across Uzania Prime though, and this means there are those within it that have never climbed before basic training, and those that have a distinct culture of their own (such as
@Drunken Conquistador and their character being more Romanian based).
Our Colonel Sabbadin, for example, comes from the more barren desert regions of Uzania Prime but is incorporated into the regimental structure and culture.
Overall we are much like the Gebirgsjäger, both Wehrmacht and modern - formed around fighting in extreme conditions whether they are mountains, desert, jungle etc, wearing WWII pattern uniforms and wielding lascarbines, and using Jerman as our regiments internal
lingua franca. We also have chameoleoline cloaks.
I have no idea how much this helps, if at all, and I'll write up a more comprehensive section later, but you're more than welcome to suggest things as well as asking more questions if they irk you.
P.S.
AFAIK the whole 'gott mit uns' or 'God is with us' thing is more of a WWI thing for the Germans, and indeed for most nations - could be wrong though.