NOAA works toward its mission through six major line offices, the National Environmental Satellite, Data and Information Service (NESDIS), the National Marine Fisheries Service (NMFS), the National Ocean Service (NOS), the National Weather Service (NWS), the Office of Oceanic and Atmospheric Research (OAR) and the Office of Marine & Aviation Operations (OMAO). and in addition more than a dozen staff offices, including the Office of the Federal Coordinator for Meteorology, the NOAA Central Library, the Office of Program Planning and Integration (PPI).