U.S. Marines UH-1Y Venom & AH-1Z Viper helicopters conduct insane close air support training airstrikes during Marine attack helicopter action at Chocolate Mountain Aerial Gunnery Range, California. br br The video shows United State Marine Corps UH-1Y Venom minigun action and rocket strikes by UH-1Y Venom and AH-1Z Viper attack helicopters at day and night time.