What are the unspoken rules when you're riding near a motorcycle club, and how can you tell if it's best to keep your distance?

What makes the role of a drill sergeant so intense that some compare it to being deployed, in terms of personal time and family life?
Why might someone feel so strongly about never leaving a house their family built, even if other options are available?
Do you see these ancient archetypes of duty and heroism actually playing out in the modern professional world?