Flight Information Service 
Flood Insurance Study 
fiscal intermediaries 
Financial Information System 
Fighter Interceptor Squadron 
FISPA 
Flood Insurance Studies 
Foreign Intelligence Service 
Floating Instruction Set 
frame information structure 
Facility Interface Sheets 
Field Information System 
Fighter Intercept Squadron 
Financial Information Systems 
Flight Information Services 
Foreign Intelligence Services 
Forms Interchange Standard 
FachInformationsSystem 
Facilities Information System 
Facilities Inventory System 
Facility Installation Standards 
factor for inversion stimulation 
factor of inversion stimulation 
Fairview Independent Schools 
Family Income Supplement 
Family Information Specialist 
Fast Ion Sensor 
fatigue impact scale 
Fault Indication Signal 
Federal Information System