Installation Restoration Program 
International Registration Plan 
I/O request packet 
Integrated Resource Plan 
Intramural Research Program 
Integrated Resource Planning 
Information Returns Processing 
INITIAL RECEIVING POINT 
Institutional Removal Program 
Interest Rate Parity 
Interference Reporting Point 
Internal Reflection Photolysis 
International Reference Preparations 
idiopathic recurrent pancreatitis 
IERS Reference Pole 
Image Reconstruction Procedure 
immune risk phenotype 
Impact Reactive Projectile 
Incentive Reward Program 
Incident Response Plan 
Independent Review Panel 
Independent Routing Processor 
individual research projects 
Individual Responsibility Plan 
Industrial Restructuring Program 
Inertial Reference Package 
Information Reporting Program 
Information Requirements Plan 
initial rally point 
initial rate of polymerization