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https://en.wikipedia.org/wiki/Bell_AH-1Z_Viper The Bell AH-1Z Viper is an American twin-engine attack helicopter, based on the AH-1W SuperCobra, that was developed for the United States Marine Corps as part of the H-1 upgrade program. The AH-1Z features a four-blade, bearingless, composite main...

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http://worldwarwings.com/15-wwii-bomber-crewmen-facts-every-warbird-guy-should-know/7/ How Many Of These Do You Know? Behind every successful air mission are two things: powerful war birds and skilled crewmen. It’s basically like doing regular day-to-day tasks with your hands — you need both. And...