Industrial Space Facility
Islamic Solidarity Fund
Importer Security Filing
Information Security Forum
Information Systems Factory
Integrated Support Facility
International Science Foundation
International Shipping Federation
International Softball Federation
Iraqi Security Forces
Imaging Science Foundation
immunosuppressive factor
immunosuppressive factors
immunosuppressive fraction
Imperial Smelting Furnace
Incoming Signal Fail
Indexed Sequential File
Indian State Forces
Individual Store and Forward
Information Security Foundation
Information Strike Force
Infrastructure Support Facilities
Initial Sounds Fluency
Institut für Schulentwicklungsforschun…
Institute of Soil Fertility
Integrated Social Forestry
Integrated Support-Fielding
Integrated Systems Facility
Intelligence Support Facility
Interaction Site Formalism