Photo: Michael YonReporter and former Green Beret... ...no name - and Michael decided to name it the Kopp- Etchells Effect, as a tribute, after Corporal Benjamin Kop... ...ribute, after Corporal Benjamin Kopp and Corporal Joseph Etchells
https://www.neatorama.com/2009/09/01/the-kopp-etchells-effect-eerie-halo-of-a-helicopters-rotor-blades-in-a-dust-cloud/
The Kopp-Etchells Effect: Eerie Halo of a Helicopter's Rotor Blades in a Dust Cloud
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