Installation Status Report
Intelligence Surveillance and Reconnaissance
Intelligence, Surveillance and Reconnaissance
Institute of Surgical Research
Initial Service Release
Identification Safety Range
Imagery Support Requirement
Implemented Status Report
Independent Sufficiency Review
Individual Soldier Radio
Individual Soldier's Report
Individual Subcontracting Reports
Industrial Security Regulation
Information Source Repository
In-Service Repair
Installation Situation Report
Intelligence Surveillance Reconnaissance
Intelligence, Surveillance, Reconnaissance
Inter-Agency Source Registry
Interchangeable/Substitute Record
Interference to Signal Ratio