The blazes remained in training areas and posed no threat to people or structures on the massive base or in surrounding communities, base officials said on social media.
But, officials said, the fires would continue to produce smoke.
"Today, there are mop-up and containment-line operations with fire crews continuing to monitor and engage hot spots," the base officials said.
The biggest fire had charred about 7,000 acres in remote training areas as of Wednesday afternoon. A second fire had burned another 1,100 acres, while a third had scorched around 500 acres, according to base officials.
Updated numbers for burned acreage were not immediately available.
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