VIPER ON APPROACH: A USMC AH-1Z Viper approaches the amphibious landing dock USS Somerset while training in the eastern Pacific. Good photo of the attack helicopter’s weapon systems. This Warplanes update from 2017 has background on the AH-1Z helicopter, which is a remanufactured and upgraded AH-1T/W attack helicopter. The AH-1T/W was an upgrade of the Vietnam era AH-1 Cobra. This photo shows two Vipers maneuvering on a target during training at Twentynine Palms, California.