The Nigerian Navy is currently structured into 11 Branches at the Naval Headquarters, 6 commands and a number of autonomous units. The 6 commands are made up of 3 operational commands – Western Naval Command, Central Naval Command and Eastern Naval Command with Headquarters located at Apapa, Yenagoa and Calabar, Naval Training Command with Headquarters at Onne as well as the Logistics and Naval Doctrine Commands with Headquarters at Oghara and Lagos respectively. Each of the 6 commands is headed by a Flag Officer of the rank of Rear Admiral. The Nigerian Navy autonomous units include Naval Ordnance Depot (NOD), Naval Doctrine and Assessment Centre (NDAC) and Navy Holdings Limited (NHL). Navy Holdings has 9 subsidiary companies. These include Naval Dockyard Limited (NDL), Naval Shipyard Limited (NSYL), Naval Building & Construction Company Limited (NBCCL), Navy Hotels & Suites Limited (NHSL), Navy Micro Finance Bank Limited (NMFBL), Navy Maritime Services Limited (NMSL), Naval Exchange (NAVEX), Naval Engineering Services Limited (NESL) and Navy Clearing and Forwarding Services Limited (NCFSL). The autonomous units and support facilities enable the Nigerian Navy to maintain the fleet and personnel for sustained operations. The Nigerian Navy has also, recently, established a Project Implementation, Monitoring and Evaluation Directorate at the Naval Headquarters for better management of Nigerian Navy projects.