The Bell AH-1Z Viper is a twin-engine attack helicopter designed and manufactured by Bell Helicopter Textron. It is the latest variant of the AH-1 Cobra family of attack helicopters, and is the only attack helicopter in production in the United States. The AH-1
From Wikipedia
The Bell AH-1Z Viper is a twin-engine attack helicopter, based on the AH-1W SuperCobra, designed and produced by the American aerospace manufacturer Bell Helicopter. It is one of the latest members of the prolific Bell Huey family. It is often called "Zulu Cobra", based on the military phonetic alphabet pronunciation of its variant letter.