Duct tape has long been used in the military. It is also known as "duck tape", "riggers' tape", "hurricane tape", or "100-mph tape" - a name that comes from the use of a specific variety of duct tape that was supposed to withstand up to 100 mph (160 km/h; 87 kn) winds. The tape is so named because it was used during the Vietnam War to repair or balance helicopter rotor blades. The duct tape is coated with polyethylene. Duct tape is commonly used in situations that require a strong, flexible, and very sticky tape. Duct tape has a long-lasting adhesive and resistance to weathering.