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o7 Rule
(slrpnk.net)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
gUYs NeEd tO tRusT tHeIr bUdDieS!11!
As long as you can ruck your weight and send the hate real soldiers don't care.
Sincerely, a combat veteran.
There probably has to be some level of cohesion (keeping it together in combat - when you're under fire, you don't want your mates to wet their pants and run away), but I would assume that's established through drill and general camaraderie, not through romantic or sexual entanglement.
You're right. Fun fact though, there's a certain percentage of people who have to pack extra pants for a patrol. And nobody cares as long as they keep fighting.