teamwork, oh i love the teamwork. those moments of frenetic activity to keep a ship alive in a 2v1 and declare when it is over: "Well, we lasted more than it was natural".
or the meta gunnery, the rapid exchange of information between the two gun operators trying to exploit a breach in the hull against a skilled opponent. holding your mortar, holding yourself from rushing to repairs, visualizing the trajectory and firing at the exact moment that the hull drops while the first projectile is about to connect.
but maybe the sweetest thing is when someone just arrived in the game follows your instructions and does a great job, the satisfaction in their voice for their first game where they felt the true spirit of GOIO. They stick around then, you search a new game with them (maybe invite someone else and introduce them) and while waiting every veteran tries to condense as much information as they can on the new recruits because they know they will listen. That feeling of having found someone like you, like us among the scrubs.
In military jargon is called a Cadre, the small group of officers that informally train the fresh regiment from within. It is a french word derived by the italian quadro, latin quadrus: the square. A tight formation of veterans in the center that will carry the regiment to victory.