A military structure is located near the coordinates provided, which place it in southern Oklahoma, United States. The provided web search results discuss historical bunker sites in Pennsylvania, such as the Alvira explosives bunkers and the Raven Rock Mountain Complex, but these are geographically unrelated to the given Oklahoma coordinates. No specific, verifiable historical or technical details about a bunker at this exact location are present in the supplied search results.
The region's broader military history is not detailed in the context of this query.