A resident over the age of sixteen years and three months who has been duly licensed as a driver under a law of another state or country requiring the licensing of drivers shall, for the first sixty days of his residency in the Commonwealth, be permitted, without a Virginia license, to drive a motor vehicle on the highways of the Commonwealth. Persons to whom military privately-owned vehicle driver’s licenses have been issued by the Department of Defense shall, for the first sixty days of their residency in the Commonwealth, be permitted, without a Virginia license, to drive motor vehicles on the highways of the Commonwealth.