The U.S. Army Research Institute for Behavioral and Social Sciences has used P.O. Box 52086 (Fort Benning, GA) as a specific administrative contact point for military leadership guides.
If you are looking for a (a .rar file) with this name, it likely belongs to a private database, a specific software patch, or a niche modding community not indexed in general public records. Combat Leaders' Guide (CLG): Leader Handbook 2003 - DTIC 52086 rar
It is listed among ports tracked for inbound network traffic in security operations monitoring, such as those analyzed by Google Security Operations . a specific software patch