ArmA 2 is a 2009 military simulation game from Bohemia Interactive, known for its large-scale combat and realistic radio communication between units. Saying over is standard radio procedure for signalling that a transmission has ended and the other party can respond, which is why the word appears so often in the game's voice files. As clips from the game were shared on soundboards and in gameplay videos, this tiny sign-off became a handy shorthand for creators making military, tactical or gaming content, and it remains useful because it is instantly recognisable even without any surrounding dialogue.