One of the things that makes us human is our tribal nature. Before man was even capable of speech we’ve relied on close knit groups for connection, safety, and sustenance. From external needs, such as protection from the elements, to internal considerations, such as the development of common rules and customs, it is the existence of community that has guided our progress from crude hunter-gatherers to modern global citizens.
In the context of today’s world, this phenomenon rings particularly true in warfare, where soldiers develop strong bonds with their fellow countrymen in order to survive extreme hardship and inevitable loss on the battlefield. There are few things in life that can bring men and women together on such a deep, tribal level.