Korvalis was an individual who became a sergeant in the Cularin Militia, a military force that was active in the Cularin system during the waning years of the Galactic Republic. During the time of the Clone Wars, Korvalis and Sergeant C. Drover together formed and trained Division Cloud Force, a Militia unit that was specialized for operations in zero-gravity environments.
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"Cloud Force" (original article link) on Wizards.com (content now obsolete; backup link) (First mentioned)