The IUSS Operations Support Center (IOSC), located on Naval Amphibious Base, Little Creek in Norfolk VA, is responsible for all aspects of logistic and technical life support for world-wide IUSS in-service assets, including eleven SURTASS ships, three IUSS Fixed Sites. The IOSC provides array support to all Navy combatant ships. Additionally, the IOSC acts as the In-Service Engineering Agent (ISEA) for the IUSS program. As ISEA, the IOSC manages and directs the support of contractors world-wide, acts as the liaison to field activities and laboratories, and provides configuration management, engineering change, technical documentation, preventative maintenance, RM & A, and Planning and Engineering for Repairs and Alterations (PERA) support. Resident Navy commands within IOSC include, SPAWAR Systems Center, Charleston, SC (SSCC), Navy Array Technical Support Center (NATSC), and Military Sealift Command (MSC). There are also a variety of Contract Companies working at the IOSC.