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The Armor branch traces its origin to the Cavalry. A regiment of cavalry was authorized to be raised by the Continental Congress Resolve of December 12, 1776. Although mounted units were raised at various times after the Revolution, the first in continuous service was the United States Regiment of Dragoons, organized in 1833. The Tank Service was formed on March 5, 1918. The Armored Force was formed on July 10, 1940. Armor became a permanent branch of the Army in 1950.