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"hell-roarer" is a US-built system for field-illumination, using a continuous fuel/magnesium dust-flame. The system was airbourne, carried like fuel-containers under the wings of an aircraft an could provide 15 minutes of continuous illumination over an area of about 5 miles for reconaissance or battlefield-illumination. It was developed and used during the Korean War 1951-1953.
http://www.ascho.wpafb.af.mil/Korea/chap7.htm
It sometimes appears also in reports about UFO-sightings during that time, eg. in the US-sector of Germany.
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