sentence: Helicopters are especially useful when there are floods and other disasters.
sentences_after: Food packets, water, medicines and clothes are dropped from the air to people on the ground who cannot be reached by road. When people are injured, helicopters can carry them to hospitals faster than an ambulance on the road. Helicopters are also used by the military, because they can move troops and equipment to places an airplane cannot take them. Guns can be mounted on them, and missiles can be shot from them.
concept_name: helicopter
headings: Helicopter Uses