In my humble, but biased opinion, no vehicle powered by a motorcycle engine has had a greater impact on world history than one I am proud to say is "mine".
Powered by what is basically the original Norton rotary engine, making 1hp for every pound of weight, and capable of continuous operation at well over 10,000 RPM for hours and hours of operation.
It is on display in the Smithsonian air and Space museum in DC, and another on display at the Huntsville, AL airport; the gateway to Redstone Arsenal.
It was watching when Navy SEALS popped Bin Laden.
It has also racked up more time in combat than the Huey Helicopter in Vietnam.
Oh yeah, it saved what you know today as Norton motorcycles.
The AAI Textron Systems Shadow 200.