Naval Surface Warfare Cener Carderock Division (NSWCCD) intends to award a firm fixed price contract for the procurement of AAON Rooftop Unit Replacement on a Brand Name basis. This does not include i... Naval Surface Warfare Cener Carderock Division (NSWCCD) intends to award a firm fixed price contract for the procurement of AAON Rooftop Unit Replacement on a Brand Name basis. This does not include installation service, material buy only.