Capt. Christopher Stapenhorst, 36th Airlift Squadron navigator, uses the E6B Flight Computer, as known "Whiz wheel" to calculate ground speed, estimated fuel burn and updated estimated time of arrival in the air, Oct. 22, 2013. (U.S. Air Force photo by Osakabe Yasuo/Released)
Yasuo Osakabe
Taken on 22 October 2013
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