| Abbreviation | Definition |
|---|---|
| ICRI | Interswitch Collective Routing Indicator |
| ICS | Integrated Communication System |
| ICS | Integrated Communications System |
| ICS | Interim Contractor Support |
| ICS | Internal Communications System |
| ICS | Inter-Service Chaplain Support |
| ICS3 | Integrated Combat service Support System |
| ICSAR | Interagency Committee On Search and Rescue |
| ICSF | Integrated Command Communications System Framework |
| ICSF | Integrated Cryptographic Service Facility |
| ICST | Institute for Computer Sciences & Technology |
| ICSTD | Integrated Combat Systems Test Detachment |
| ICT | In-Circuit Test |
| ICT | Individual and Collective Training |
| ICTD | Charge Transfer Device |
| ICTF | Control Transfer Function |
| ICTP | Individual and Collective Training Plan |
| ICTT | Interim (or Improved) Commander's Tactical Terminal |
| ICTT | Interim Commander's Tactical Terminal |
| ICU | Interface Control Unit |