So I've noticed that Norse mythology is a lot alike Alethi religions.
The Norse believed that if you died while doing a heroic deed, with a weapon in your hand, a Valkyrie riding on a flying stallion would take your soul to Valhalla. There, you and the other souls would practice fighting for Ragnarok, the end of the world.
Alethi religions say that after you die, you join the battle to retake the Tranquiline Halls, and that the highest Calling is to be a soldier.
I don't know if Brandon did this on purpose, or if it's a coincidence. I just love studying mythology (Greek, Roman, Norse, and Egyptian) and thought this was cool