National Incident Management System 
Near Infrared Mapping Spectrometer 
Near-Infrared Mapping Spectrometer 
National Incident Management Systems 
NASA Interface Monitoring System 
National Institute for Materials Scien… 
Net Interest Margin Securities 
Network Information Management System 
Nuclear Instrumentation Modular System 
NAS infrastructure management system 
National Airspace System Infrastructur… 
National Incident Managment System 
National Infant Mortality Surveillance 
National Infant Mortality Survey 
National Institute of Metalworking Ski… 
National Interagency Incident Manageme… 
National Inventory Management Strategy 
NATSF Information Management 
Navy Ionospheric Monitoring System 
Near-IR Mapping Spectrometer 
negative ion mass spectrometry 
Novell Internet Messaging System 
National Institute for Machining Stand…