I
(Chem.) Iodine, (Mech.)moment of inertia     I
(light) intensity of light, luminous intensity     i
Indications and Warnings    I&W
island, isle, inclination, intensity, moment of inertia     I.
(Aero.) indicated air speed     I. A. S.
International Civil Aviation Organization     I. C. A. O.
Inter-continental ballistic missile     I. C. B. M.
(Radio.)interrupted continuous waves     I. C. W.
(Eng.) internal (inside) diameter     I. D.
(Teleph.) intermediate distribution frame     I. D. F.
(Aero.) instrument flight rules     I. F. R.
(Aero.) instrument landing system     I. L. S.
International Monetary Fund     I. M. F.
(Eng.)indicated mean effective pressure     I. M.E. P.
Initial pressure     I. P.
inches per minute    i. p. m.
inches per second    i. p. s.
 the same as     i. q.
international unit(s)     I. U.
(Phys.) isotopic weight     I. W.
incendiary bomb     I.B.
International cooperation Administration, International Cooperative Alliance    I.C.A.
Interstate Commerce Commission, International Chamber of Commerce    I.C.C.
International Court of Justice     I.C.J.
 that is    i.e.
Irish Free State     I.F.S.
Indo Germanic, Inspector General     I.G.
International Geophysical Year     I.G.Y.
International Labor Organization     I.L.O.
 Jesus of Nazareth, king of the Jews     I.N.R.I.
(Mech.) intermediate pressre    i.p.
International Scientific Vocabulary    I.S.V.
International Trade Organization    I.T.O.
Industrial Workers of the World     I.W.W.
Insufficient funds     I/F
input/output    I/O
Irrespirable Atmosphere    IA
Iowa     Ia.
Iraqi Air and Air Defense Forces    IAADF
Inter-American Development Bank    IADB
Iraqi Air Defense Forces    IADF
Integrated Air Defense System     IADS
International Atomic Energy Agency    IAEA
International Atomic Energy Commission     IAEC
Italian Air Force     IAF
Indicated airspeed, ASIR corrected for instrument error.    IAS
International Air Transport Association.    IATA
International Air Transport Association     IATA
in accordance with    iaw
ibidem    ib. or ibid.
Integrated Biological Detection System    IBDS
International Bank for Economic Cooperation    IBEC
International Bank for Reconstruction and Development    IBRD
integrated circuit    IC
Individual Chemical Agent Detector    ICAD
Improved Chemical Agent Monitor    ICAM
Improved Chemical Agent Monitor - Detector    ICAM-D
International Civil Aviation Organization    ICAO
International Commercial Aviation Organization    ICAO
intercontinental ballistic missile    ICBM
information co-ordination control    ICC
International Chamber of Commerce    ICC
Intergovernmental Committee for European Migration    ICEM
International Confederation of Free Trade Unions    ICFTU
International Court of Justice    ICJ
Intergovernmental Committee for Migration    ICM
integrated countermeasures system    ICMS
integrated communications, navigation and identification avionics    ICNIA
International Committee of the Red Cross    ICRC
International Red Cross and Red Crescent Movement    ICRM
Integrated Communications System    ICS
infantry combat vehicle    ICV
improved continuous wave acquisition radar    ICWAR
 same     id.
Improved dogbone assembly    IDA
International Development Association    IDA
Islamic Development Bank    IDB
Israel Defense Forces    IDF
Ionization (Ionization) Detector Unit    IDU
International Energy Agency    IEA
Improved Emergency Message Automation Transmission System    IEMATS
intermediate frequency    IF
International Fund for Agricultural Development    IFAD
International Finance Corporation    IFC
improved (integrated) fire control system    IFCS
International Federation of Christian Trade Unions    IFCTU
Identification Friend or Foe    IFF
instantaneous frequency measurement    IFM
ISO Compatible Palletized Flatrack    IFP
Instrument Flight Reference    IFR
Instrument flight rules (compare VFR) also in-flight refueling.    IFR
International Federation of Red Cross and Red Crescent Societies    IFRCS
Infantry Fighting Vehicle    IFV
Inter-Governmental Authority on Development    IGAD
Inter-Governmental Authority on Drought and Development    IGADD
instrumentation graphics environment    IGE
improved high explosive    IHE
integrated helicopter electronic warfare suite    IHEWS
International Hydrographic Organization    IHO
 Jesus, Savior of Men     IHS,
Image Intensifier or Intensifying. An electro-optical sight incorporating electronic amplification of ambient light to present an enhanced view of the target area. Completely passive and undetectable, though some early units emitted a high-pitched noise which alarmed animals.    II
International Investment Bank    IIB
Intelligence Information Report or Imaging Infrared    IIR
interactive keyboard and terminal    IKAT
(Chem.) illinium    Il
illustrated, illustration     ill.
Illinois    Ill.
illustrated, illustration     illus.
Intermediate-Level Maintenance    ILM
Intermediate-Level Maintenance Center    ILMC
International Labor Organization    ILO
integrated logistic support or instrument landing system (VHF-band aircraft landing aid)    ILS
Individual Mobilization Augmentee    IMA
Instrument meteorological conditions    IMC
Intergovernmental Maritime Consultative Organization    IMCO
International Military Education and Training    IMET
Improved mine fuse    IMF
International Monetary Fund    IMF
Imagery intelligence    IMINT
imitation, imitative     imit.
Increased maneuverability kit.    IMK
Improved medium mobility load class    IMMLC
International Maritime Organization    IMO
improved    Imp
imperative, imperfect, imperial, import,
imported, importer, imprimatur     imp.
 Emperor, Empress     Imp.
imperative    imper.
imperfect    imperf.
1.20095 US gallons 4.546 liters.    Imperial gallon
Initial Mission Qualification Training    IMQT
Integrated multiplex system.    IMS
inertial measurement unit    IMU
inch    in
(Chem.) indium     In,
inch(s)    in.
Integrated nav/attack system.    INAS
in closure, included, including, inclusive
incorporated, increase     inc.
Integrated Nuclear Communications Assessment    INCA
includes/including    Incl
in closure, including, inclusive     incl.
incognita, incognito     incog.
increase, increased, increasing     Incr.
Investigational New Drug    IND
independent, index, indicative, industrial, industry.    ind.
India, Indian, Indiana     Ind.
indefinite     indef.
independent    Indep
indicating, indicative     indic.
Fire in which the weapon and the target are not within sight of each other.    Indirect fire
individual    individ.
industrial, industry     indus.
integrated electronic warfare system    INEWS
infantry    inf
intermediate range nuclear forces (treaty)    INF
infinitive, information     inf.
infinitive    infin.
influenced    infl.
initial    init.
International Maritime Satellite Organization    INMARSAT
International Mobile Satellite Organization    Inmarsat
Indian Ocean Commission    InOC
inorganic     inorg.
Inertial navigation system    INS
inspector, insulated, insurance     ins.
insoluble    insol.
inspector    insp.
instant, institute, institution, institutional, instrumental     inst.
instructor, instrument, instrumental     instr.
Iternational Research and Training Institute for the Advncement of Women    INSTRAW
interest, interior, interjection, internal,
international, interpreter, intransitive     int.
Integrated Tactical Communications Study    INTACS
International Telecommunications Satellite Organization    INTELSAT
intensive    intens.
Wired telephone system for communication within aircraft.    intercom
interjection     interj.
international     internat.
International Criminal Police Organization    INTERPOL
interrogative, interrogation    interrog.
International Organization of Space Communications    Intersputnik
international     intl.
intransitive     intr. or intrans.
Introd., Introduction, introductory     intro.
invented, inventor, invoice     inv.
(Chem.) ionium    Io,
initial operating capability    IOC
Intercept Operations Center or Integrated Operations Center    IOC
International Olympic Committee    IOC
Improvised ordnance disposal    IOD
International Organization for Migration    IOM
integrated operational nuclear detection system    IONDS
integrated observation system    IOS
Initial Operational Test and Evaluation    IOT&E
Initial Operational Test and Evaluation    IOTE
I owe you    IOU
Initial Point    IP
intellectual property, or initial production    IP
International Phonetic Alphabet     IPA
Intermediate-pressure compressor, turbine.    IPC, IPT
improved point defense    IPD
Inland Petroleum Distribution System    IPDS
Individual Protection Ensemble    IPE
intellectual property rights    IPR
instructions per second    ips
Intelligence quotient    IQ. or I.Q.
Infra-Red    IR
(Chem.) iridium     Ir
Internal research and development    IR&D
Ireland, Irish     Ir.
Iraqi Air Force     IRAF
Inspect and repair as necessary.    IRAN
intermediate range ballistic missile    IRBM
infra-red countermeasures    IRCM
Ireland     Ire.
Infra-red linescan    IRLS
Individual Ready Reserve    IRR
Integrated Radio Room    IRR
irregular, irregularly     irreg.
Inertial reference system.    IRS
Infra-Red Search and Track    IRST
Improved recovery vehicle    IRV
Internal Security. Generally describes the use of troops to aid the civil power.    IS
island, isle    is. or isl.
International Standard Atmosphere.    ISA
inverse synthetic aperture radar    ISAR
independent sideband    ISB
Infantry section carrier    ISC
in-service date    ISD
integrated services digital network    ISDN
Integral spar inspection system.    ISIS
interrogator sidelobe suppression    ISLS
Islands    isls.
International Standardization Organization    ISO
Integrated Strike Warfare    ISW
information technology    IT
Italian, Italy     It. or Ital.
Intelligence and Threat Analysis Center    ITAC
Intelligence Task Force    ITF
intent to purchase    ITP
integrated tactical surveillance system    ITSS
invitation to tender    ITT
International Telecommunication Union    ITU
inertial upper stage    IUS
integrated undersea surveillance system    IUSS
intravenous, intravenously    IV.
Integrated Vehicle Communications System    IVCS
interactive video disk    IVD
integrated voice and data network    IVDN
intelligent visual display unit    IVDU
Industrial Vehicle Corporation    IVECO
Instantaneous VSI.    IVSI
Initial Voice Switched Network    IVSN
light    lt