The Sonoma County Sheriff's Office says the guardsman was maneuvering across extremely steep terrain when he slipped and fell 100 feet down a hill.
RELATED: North Bay firefighters close to containing LNU Lightning Complex Fire, but wary of hot weather this weekend
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The guardsman suffered a leg injury.
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A sheriff helicopter arrived within 10 minutes.
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There is no update on his status.
VIDEO: Video shows terrifying escape through flames of LNU Lightning Complex fires
Video shows terrifying escape through flames of LNU Lightning Complex fires