 Army helicopters were also used to insert search-and-rescue [SAR] teams into inaccessible areas on the east, north, and west sides of the mountain, lowering rangers to the ground by a cable device known as a "jungle penetrator".Helicopters began assisting with high altitude (above 10,000 feet) SAR operations in the 1980s.Helicopters were also used for "short haul" rescue operations, in which a ranger and litter were carried in a sling below the helicopter to the scene of the accident.