The Combine are the authoritarian alien regime that occupies Earth in Valve's Half-Life 2, first released in 2004, and their soldiers communicate through heavily filtered radio bursts that became one of the game's most recognisable audio signatures. Short lines and effects from those patrol encounters have long been ripped, shared and reused by fans, especially in gameplay videos, Source engine memes and Half-Life edits. This blackout call survives because it is instantly recognisable, easy to drop over a cut, and carries the game's tense, dystopian mood in just two seconds.