This is a Sources Sought notice for the post-production maintenance support of classified Navy AN/PLT-4 CREW systems and legacy channel systems. The Naval Surface Warfare Center Indian Head Division intends to award a sole-source, cost-plus-fixed-fee contract to Peraton, the original equipment manufacturer, as they are deemed the only capable vendor. The performance location is not specified in this description. The notice clarifies this is not a competitive solicitation but will consider all responses, with a submission deadline for capability statements provided. No budget information is listed.