e Electrons (Negatively charged particles.) EB Earth bombardment ECM Electronic countermeasures EC/LSS Environmental control and life support system EDL Electric discharge laser EEC European Economic Community (Common Market) ELF Extremely low frequency radio signals ELINT Electronic intelligence to analyze characteristics of a transmitter, especially radar (See also COMINT and SIGINT) EMP Electromagnetic pulse (specifically, from a nuclear explosion) EOB Electronic order of battle ER Earth irradiation ESA European Space Agency EW Electronic Warfare FAA Federal Aviation Administration FBI Federal Bureau of Investigation FCS Fire control system FEL Free electron laser FOBS Fractional-orbit bombardment system GEO Geosynchronous Earth orbit GFRTP Graphite fibe^ reinforced thermoplastic GHz Gigaherts (10 cycles per second) GNP Gross National Product GPS Global Positioning System GW Gigawatt (109 watts) y Gamma rays H+ Positive hydrogen ions Hard. Hardening HE Conventional high explosives HEL High energy laser HF Hydrogen flour ide HF High frequency HFDF High frequency direction finder HLLV Heavy lift launch vehicle ICBM Intercontinental ballistic missile INTELSAT International Telecommunications Satellite Organization IR Infrared IS Industrial security measures ITU International Telecommunications Union 3 keV 10 electron volts kV Kilovolt kW Kilowatt
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