S.D. Codified Laws § 32-12-45
A valid South Dakota operator's license, motorcycle operator's license, restricted minor's permit, motorcycle restricted minor's permit, instruction permit, or motorcycle instruction permit held by any active duty member of the United States armed forces, or held by a spouse or a dependent of any active duty military member serving outside this state, shall continue in full force and effect so long as the service continues and the person remains absent from this state, not to exceed ninety days following the date on which the holder of the license is honorably separated from such service or returns to this state, whichever is earlier, unless the license is sooner suspended, canceled, or revoked for cause as provided by law. The license is valid only when in the immediate possession of the licensee while driving and the licensee has military-issued identification, orders, discharge or separation papers in the licensee's immediate possession. A license may also be renewed electronically or by mail pursuant to § 32-12-43.1. Any person renewing a permit or license under this section more than thirty days after the expiration date on the permit or license may be required to show military identification, orders, separation, or discharge papers.
SDCL 32-12-45