Death Duty

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TAKE DOWN THOSE GANGSTERS WITH YOUR GUNFIRE!
Our office was hijacked by a group of gangsters in a building,and our troop received the mission to rescue the officer in that building,the mission is code named "Death Duty". If we failed the mission,it's possible that the gangsters might kill the officer.So this is a mission we cant fail and cant say no! As one of the elite troop snipers,you are sent there to take part in the mission,your job is to kill those guards and hidden gangsters that might shoot you with their weapons.It's full of dangers in that building so you have to be careful of those gangsters,choose your path carefully,one step mistake might result in the failure of the mission.
Don't hesitate to shoot those gangsters once you find where they are,or they will shoot you back,no mercy,no hesitation,no failure!Come on,soldier,talk to them with your gunfire,let them feel you anger!