I Improved
IAA Indian Astronautical Association
IAA International Academy of Astronautics
IAF International Astronautical Federation
IAS Infrared Astronomy Satellite
IAS Institut d'Astrophysique Spatiale
ICBM Inter-Continental Ballistic Missile
IDA Institute for Defense Analysis
IDCSS Initial Defense Communication Satellite System
IDSCP Initial Defense Satellite Communications Program
IE Ionosphere Explorer
IFE In-Flight Exerciser
IFP In-Flight Phonocardiogram
IFSA In-Flight Sleep Analysis
IFSARS Inter-Ferometric Synthetic Aperture RadarS
IG Inertial Guidance
IGY International Geophysical Year
IIP Instantaneous Impact Prediction
IISL International Institute of Space Law
ILS International Launch Services
ILS International Lunar Society
IM Interceptor Missile
IMC Image Motion Compensation
IMEWS Integrated Missile Early Warning Satellite
IML International Microgravity Laboratory
IMP Inflatable Micrometeroid Paraglide
IMP Interplanetary Monitoring Platform
INSAT INdian SATellite
INTA Instituto Nacional de Técnica Aerospacial
INTELSAT INternational TELecommunications SATellite
IOC Initial Operating Capability
IOT Initial Orbital Time
IP Impact Point
IP Initial Phase
IPEI Ionosphere Plasma Electrodynamics Instrument
IPL Image Processing Laboratory
IRAS Infra-Red Astronomical Satellite
IRBM Intermediate Range Ballistic Missile
IRFNA Inhibited Red Fuming Nitric Acid
IRIS International Radiation Investigation Satellite
IRM Ion Release Module
IRS Information Research Service
IRTM Infra-Red Thermal Mapper
IS Ionosphere Satellite
ISA Israel Space Agency
ISAC Ion-Sensing Attitude Control
ISAC Isro SAtellite Centre
ISAS Institute of Space and Astronautical Science
ISEE International Sun-Earth Explorer
ISIS International Satellite for Ionospheric Studies
ISO Infrared Space Observatory
ISR Infrared Scanning Radiometer
ISR Intelligence Surveillance Reconnaissance
ISRO Indian Space Research Organisation
ISS Inertial Solid Stage
ISS International Space Station
ISTRAC ISro's Telemetry tRacking and Command network
ITA Instrumentation Technology Associates, inc
ITHD Interferometric Terrain Height Data
ITOS Improved Tiros Operational Satellite
ITT International Telephone and Telegraph
ITU International Telecommunications Union
IUE International Ultraviolet Explorer
IUS Inertial Upper Stage
IWFNA Inhibited White Fuming Nitric Acid
IWM Ion Wake Measurement
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