War Thunder is a free to play combat game by Gaijin Entertainment, first released in 2012, focused on aircraft, tanks and ships. Its radar warning receiver is based on real cockpit systems that warn pilots when they are tracked by enemy radar, a moment players often describe as enemy spotted in chat. As gameplay clips spread on YouTube and TikTok, the short lock tone became a standalone meme sound outside matches, reused wherever a creator needs an instant military warning that needs no context or dialogue.