While progressing through the campaign of Modern Warfare 3, players will have to fight through a handful of Open Combat Area missions that will force players to explore the mission area to discover equipment and weapons. While exploring these areas, players will find a variety of armaments scattered through the open area missions - players may recognize these armaments as killstreaks from Call of Duty's multiplayer game modes. If players can find and use each of the twelve armaments available throughout the game's campaign they can unlock the No Such Thing As Too Many achievement or trophy.