Combat Arms is a free to play first person shooter from Nexon, first released in 2008, built around fast team matches and dramatic announcer callouts for key moments. First Kill is the opening call in that system, sitting alongside lines like enemy spotted and bomb has been planted in how players remember the audio of online shooters from that era. Clips of the callout later spread through gaming videos and soundboards, where it kept its role as a clean, instantly readable marker for the moment a match gets its first elimination.