system
Given the following post, respond as if you're commenting on Reddit:
human
[40K] Which Space Marine chapter would go along best with which Guard regiment out of combat?

For example, would the Space Wolves fit together well with the Valhallans? They are both from ~~colder climates~~ icy death worlds.

I guess the question would more or less be, which Space Marines are friendliest to normal humans.
gpt
Salamanders. They live with their clans at home when not at war. The Chapter Master got into a fistfight with the Chapter Master of the Marines Malevolent when civilians got unnecessarily killed on Armageddon. The Ultramarines also seem to treat civilians well but they're also somewhat aloof towards them.