Counter-Strike began as a Half-Life mod in 1999 before the 1.6 retail update in 2003 fixed its radio menu in players' memories. Built-in voice commands let teams coordinate without microphones, with callouts like Enemy Spotted and bomb has been planted becoming shorthand across the wider FPS community. Short acknowledgements like this one survived through soundboards, frag movies and meme edits long after newer Counter-Strike versions replaced many original samples, because the low-fi radio tone instantly signals an old-school tactical round.