The Authorities' helicopters are military helicopters used for transporting troops or cargo. They are equipped with a backup pair of rotors in case of severe damage to the rotors.
The Authorities' bomber helicopters are specially designed to carry and deploy a variety of bombs.
It was a black helicopter, specially designed for bombings. Inside its cargo hold were contained several dozen bombs of various types. The whir of the blades couldn’t even be heard over the sound of the battle below.