160th Special Ops Aviation Regiment .
160th Special Ops Aviation Regiment or 160 SOAR is the U. S. paratroops of that delivers helicopter assisstance during a special operation. These troopers are also known as Night Stalkers or Task Force Brown as they operate their missions during the nighttime.
This guerilla troops are special trained forces that can work in any weather, any-time (day or night). Their operations are matchless and precise. This special force can work in any part of the world as well, not just limiting to the boundaries of the US.
Thus the correct answer is the '160th Special Ops Aviation Regiment .'