| Abbreviation | Definition |
|---|---|
| ECAC | Electromagnetic Compatibility Analysis Center |
| ECAT | ELINT (ELectronic INTelligence) Correlation And Tracking |
| ECB | Earth Covered Building |
| ECB | Echelons Corps and Below |
| ECB | Engineering and Construction Batallion |
| ECB | Engineering Change Board |
| ECBC | Edgewood Chemical and Biological Center |
| ECBRS | Enhanced Concept Based Requirements System |
| ECC | Engineer Coordination Cell |
| ECC | Evacuation Control Center |
| ECC | EXFOR Coordination Cell |
| ECC | Experiment Control Center |
| ECCC | Export Commodity Control Code |
| ECCIS | Engineer Command and Control Information System |
| ECCM | Electronic Counter- Countermeasure |
| ECCM | Electronic Counter-CounterMeasures |
| ECCS | Engineer Command and Control System |
| ECD | Engineering Change Decision |
| ECD | Exercise Control Directorate |
| ECD | Expected Completion Date |