The clip comes from the S.T.A.L.K.E.R. first person shooter series created by GSC Game World, beginning with Shadow of Chernobyl in 2007 and set in the Chernobyl Exclusion Zone. Duty is one of its militarised factions, and its soldiers use short combat barks like this attack call during firefights. Files numbered by fans circulated on soundboards alongside other tactical callouts such as enemy spotted, keeping the line alive for edits, gaming videos and memes long after the original missions.