page_title: H-1 upgrade program
hierarchical_section_title: H-1 upgrade program
caption_attribution_description: A U.S. Marine Corps Bell AH-1Z Viper and a Bell UH-1Y Venom during trials aboard the U.S. Navy amphibious assault ship USS Bataan (LHD-5) off the Virginia Capes. The sea trials comprised 267 landings during nearly 30 flight hours, conducted both day and night.
context_page_description: The H-1 upgrade program is the United States Marine Corps's program to develop the AH-1Z Viper and UH-1Y Venom military helicopters to replace its aging fleets of AH-1W SuperCobras and UH-1N Twin Hueys. The contract was awarded in 1996 to Bell Helicopter, the original manufacturer of both aircraft, to design the new airframes as modernized attack and utility helicopters with considerable design commonality, to reduce operating costs.
context_section_description: The H-1 upgrade program is the United States Marine Corps's program to develop the AH-1Z Viper and UH-1Y Venom military helicopters to replace its aging fleets of AH-1W SuperCobras and UH-1N Twin Hueys. The contract was awarded in 1996 to Bell Helicopter, the original manufacturer of both aircraft, to design the new airframes as modernized attack and utility helicopters with considerable design commonality, to reduce operating costs.
caption: An AH-1Z Viper and a Bell UH-1Y Venom during trials aboard the USS Bataan (LHD-5) in 2005
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