A structure identified as 'SK Kommando' is located at the provided coordinates in the Morbihan department of Brittany, France. The precise nature, historical function, and construction date of this site are not confirmed by the available web search results. The search results provided discuss France's broader nuclear weapons policy and deterrence strategy but contain no specific information linking them to this particular location or the 'SK Kommando' designation.
Further localized historical or archaeological research would be required to verify its identity and purpose.