Smithsonian Air&Space on Kopp-Etchells Effect
November 04, 2009 Helo Halo Luminous halos twirled above a Boeing CH-47 Chinook on a recent night around 11:30 p.m. local time at Forward Operating Base Jackson in Sangin, Helmand Province, Afghanistan, as helicopters ferried casualties and supplies in and out of the base. The photographer was independent journalist Michael Yon, a former U.S. Army Special Forces soldier who has covered Iraq, Afghanistan…

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Smithsonian Air&Space on Kopp-Etchells Effect