<P> In Metal Gear Solid 2, the enemy guards are given more advanced AI "to prevent an imbalance of power," and unlike the original Metal Gear Solid, work in squads . They call on their radios for a strike team upon seeing the player, then attempt to flank him and cut off his escape while avoiding the player's attacks . Often strike teams will carry body armor and riot shields, making them a greater threat . Even if the player escapes to a hiding place, a team will sweep in to check the area . The game has a collective enemy AI, where enemy guards work together in squads, can communicate with one another, and react in a more realistic manner towards the player . The game's enemy AI was considered one of the best in gaming for many years . </P> <P> The game expanded its predecessor's cover mechanic, with Solid Snake or Raiden able to take cover behind walls or objects and pop out to shoot at enemies, while the improved enemy AI allowed enemies to also take cover from the player character . The enemies will often take cover to call for backup, but during battle, they will take cover then pop out and shoot at the player or blindly throw grenades from behind their cover . The game features a laser sight mechanic, where a laser sight helps assist with manually aiming a gun . Boss battles and set - pieces remain a case of finding a strategy that bypasses the defenses of the enemy . However, in a major break from action game standards, it is also possible to clear the entire game, including boss fights, without causing a single deliberate death, through use of tranquilizer guns, stun grenades, and melee attacks . </P> <P> The protagonist of Metal Gear Solid 2 is a young rookie agent named Raiden . He is supported by his commanding officer, the Colonel, and Rosemary, his girlfriend . Allies formed on the mission include Lt. Junior Grade Iroquois Pliskin, a Navy SEAL of mysterious background who provides his knowledge of the facility and later revealed as the claimed terrorist Solid Snake; Peter Stillman, a NYPD bomb - disposal expert; Otacon, a computer security specialist; and a cyborg ninja imitating Gray Fox's persona, first calling itself Deepthroat, then changing its name to Mr. X . </P> <P> The antagonists are the Sons of Liberty, a group of terrorists who seize control of the Big Shell Disposal Facility, including anti-terror training unit Dead Cell, and a Russian mercenary force . The Dead Cell team members are Vamp, an immortal man exhibiting vampire - like attributes; Fatman, a rotund man with exceptional knowledge of bombs; and Fortune, a woman capable of cheating death by apparently supernatural means . The leader of Sons of Liberty claims to be Solid Snake, previously declared dead after a terrorist attack, later revealed to be Solidus Snake, a third clone in "Les Enfants Terribles" project . Assisting the Sons of Liberty are Olga Gurlukovich, commander of a rogue Russian mercenary army, and Revolver Ocelot, a disenfranchised Russian nationalist and former FOXHOUND agent, Solid Snake's old nemesis, and henchman of Solidus Snake . </P>

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