The phrase brothers in arms has been around since the 1480s for fellow soldiers and knights.

In the military, there’s historically been emphasis on the concept of fraternity and camaraderie among soldiers, and brothers in arms represents such a mentality.

In the phrase, arms is used explicitly in the sense of “weapons,” ultimately originating from the Latin arma, which variously refers to troops, war, and the tools of war. 

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Though brothers in arms originated as a means to show the unique bond between those who serve together, by at least the 1980s it was being used for strong bonds between civilian's forged by some shared experience.

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This phrase has long been used in the Call of Duty series between gaming Clans that share a bond for the game and between each other as well as being honorary members of each others clans.

The strong camaraderie of this game knows no bounds!

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IAF lists those who share that bond and support as well as the dedication to keeping it going as long as possible!