"Designated Marksman" was a planned campaign mission in Call of Duty 4: Modern Warfare. All that proves its existence is a file called "compass_map_marksman.iwi" present in the game's source files. In the mod tools, in the raw/English/localizedstrings folder, a file called "marksman.str" can be found. The string file includes information about the level, such as its location, the level name, the date, and various objectives.