Elite Gang Ambush

Couple of our friends were abducted by an elite gang member. We need to rescue them and put an end to this long lasting conflict with those elite gang member.
We'll need you to breach to their skyscraper building floor by floor to find our friends and ambush most of the gang member, but it's not going to be easy. The gang member have all the weapons and man power available. You need to carefully plan for the strategy and do the breach slowly and quitely.