Modern Warfare's single-player campaign focuses on realism and features tactically-based moral choices whereupon the player is evaluated and assigned a score at the end of each level; players have to quickly ascertain whether NPCs are a threat or not, such as a civilian woman who is believed to be reaching for a gun, but then simply grabs her baby from a crib. This collateral damage score, referred to as a threat assessment, is based on how many civilians the player injures or kills and ranges from rank A to F. Rewards are introduced to those who score higher.[5] Character dialogue will differ depending on the choices the player makes in the game.[6] Tactical decisions are also included, such as the player using a sniper rifle in a large environment to approach objectives in a non-linear order, and choosing to shoot out lights in favor of using night-vision goggles during breaching and clearing.[5]