Internal Revenue Service 
Inertial Reference System 
Interface Requirements Specification 
Internal Revenue Service's 
Indian Remote Sensing 
Integrated Radiator System 
INDEPENDENT REAR SUSPENSION 
Interface Requirements Specifications 
India Remote Sensing 
Indian Remote Sensing System 
indoor residual spraying 
Inertial Reference Systems 
Information Reporting System 
Information Requirements Specification 
Information Requirements Study 
Information Retrieval Service 
Information Retrieval System 
infrared spectroscopy 
initial receive sequence 
insulin receptor substrate 
Integrated Resource and Schedule 
Interest Rate Swap 
Interface Requirement Specification 
Intergovernmental Relations Staff 
Intermedia Ranking Staff 
Intermediate Reference System 
Internal Reflection Spectroscopy 
International Referral Systems 
Item Reduction Study 
IATA code for Kirsch Municipal Airport…