S.D. Codified Laws § 3-12C-1208
No retirement benefit may be paid unless the system has received a completed application for a retirement benefit, including the benefit option elected. The application must be signed by the generational member, and the member shall provide a copy of the member's current driver license or other picture identification card issued by a government agency or tribe. If the member is married, the spouse must sign the application and provide a copy of the spouse's current driver license or other picture identification card issued by a government agency or tribe.
A member who is married is not required to obtain the signature of the member's spouse if the member submits a completed form, in which the member certifies, under the penalty of perjury, that the member is unable to obtain the signature of the member's spouse because either:
If the member is unable to obtain the signature of the member's spouse for either reason, the member must elect the sixty percent joint and survivor benefit pursuant to § 3-12C-1209 and provide documentation to support the assertion of subdivision (1) or (2) of this section.
SDCL 3-12C-1208