Army Rangers (75th Ranger Regiment)move into position after being inserted on top of buildings by a Night Stalkers MH-6 Little Bird helicopter during a direct action demonstration.
U.S. Army Rangers are a light infantry special operations unit with roles that include direct action raids, airfield seizures and providing security for other special operations forces (SOF).
As shown here, Rangers train and operate with the 160th Special Operations Regiment, aka the Night Stalkers, the elite U.S. Army aviation unit.