International Aviation Management Training Institute

International Peace Institute (IPI) / International Peace Academy (IPA)

Stockholm International Peace Research Institute (SIPRI) (швед. Stockholms internationella fredsforskningsinstitut)

International Institute for Strategic Studies (IISS)

Institute of Cadre Management Suzhou

international humanitarian law (See international law of armed conflict)

International legion for the Defence of Ukraine (ILDU) / International Legion of Territorial Defence of Ukraine / Ukrainian Foreign Legion

International Military Sports Council (IMSC) / Conseil International du Sport Militaire (CISM)    

International Civil Aviation Organization (ICAO)

working group on meteorological services to be provided to international general aviation

International Agricultural Aviation Center

International aviation data registry

international aviation emission(s)

International Aviation Safety Assessment Programme

International Aviation Weather Service Programme

International Business Aviation Council

International Court of Aviation and Space Arbitration

International Data Exchange for Aviation Safety Group

international general aviation

Institute for the Study of War (ISW)

military institute

Royal United Services Institute for defense and Security Studies (RUSI)

United States Naval Institute (USNI)

U.S. Naval Institute

institute an award

European Telecommunications Standards Institute (ETSI)

digital training management system (DTMS)

training management

training management wargame

Civil Aviation Training Center

live-fire training (field-fire training)

on the job training (OJT) / on-the-job training

all-embracing system of international security