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You were playing Metal Gear Solid 4 when at a part of the game it went to the old part and you dont know how to kill someone without a weapon

You were playing Metal Gear Solid 4 when at a part of the game it went to the old part and you dont know how to kill someone without a weapon
You're not supposed to kill anyone. You're just supposed to sneak into the tank hangar. Avoid the guards and use the stairs in the NE corner of the map to find a hole and crawl through it.