Tactical Ops: Assault on Terror is a semi-realistic counter terrorism first person shooter (FPS) powered by the Unreal Engine, published by Microprose. It began its life as a mod for the popular FPS, Unreal Tournament, created by a team of video game fans from all over the world who simply worked on it for the love of the game. Originally known as SWAT, then Tactical Ops, and now Tactical Ops: Assault on Terror, the project began in late 1999, and its first release, Beta 1 was released freely over the Internet in June of 2000. Tactical Ops: Assault on Terror was released in American stores on 24 April 2002, with a paired Unreal Tournament mod version released on this website, which contained less maps than retail version.