having a bean bag round launcher. Bullet penetration is simulated, making "spray and pray" fire risky due to the possibility of hitting an unseen NPC. Available equipment includes stun grenades and tear gas grenades to stun suspects; explosive breaching charges to break through locked doors; glow sticks to mark items or locations of note; multi-tools for utility actions such as lock picking; and most prominently the "Opti-Wand", a fiberscope-like camera on a telescoping wand used for safely looking around corners and through doorways. Officers wear body armor and enclosed combat helmets with built-in respirators and head-up display projectors inside the faceplate, used to explain the presence of the HUD. The HUD is minimal displays the player's crosshair, stance, commands, and health (the latter as vital sign sensor readings); health in particular cannot be healed or regenerated during a mission. Missions can be approached in either stealth or dynamic mode. In stealth mode, the SWAT team moves slowly and deliberately, speaking softly and avoiding loud noises (e.g. quietly lock picking a locked door instead of kicking it down), giving the player the element of surprise. In dynamic mode, the team moves quickly, speaks loudly, and freely uses loud weaponry and equipment (such as breaching charges, grenades, and firearms) to clear an area rapidly. Modes are not set, and the player can freely shift between them, though the game automatically shifts from stealth to dynamic when the team is compromised by a loud noise or contact with a suspect. Difficulty levels range through easy, medium and hard, affecting the aggression and likelihood of surrender of suspects. The player can also separately adjust reaction times for both officers and suspects, from 1 to 20 milliseconds. SWAT 3 also includes a multiplayer mode, including traditional deathmatch and team deathmatch modes, as well as cooperative play using the singleplayer missions. Following the purchase of Sierra by Activision, the SWAT 3 multiplayer servers went down permanently, though unofficial third-party servers are still maintained by players. SWAT 3 includes tools and support for modifying the game. A modding community has grown around SWAT 3, producing new missions, maps, weapons, and character models for use in both singleplayer and multiplayer modes. Plot In 2005, the United Nations prepares to sign the Nuclear Abolition Treaty at the Los Angeles Convention Center. The event draws world leaders, representatives, and tourists to Los Angeles, but also violent criminals and terrorists seeking