| E |
| E&E | Emergency and Evacuation |
| E&E | Escape and Evasion |
| E/RC-47 | Electronics/Reconnaissance |
| EAC | Emergency Actions Center |
| EAD | Engineering Advisory Division |
| EAM | Electronic Accounting Machine |
| EBD | Engineer Base Depot |
| EC | Engineer Corps |
| ECAD | Engineer Control Advisory Detachment |
| ECAP | Engineering Civic Action Program |
| ECC | Evacuation Control Center |
| ECCOI | Eastern Construction Company International |
| ECD | Electronic Combat Detachment |
| ECL | English Comprehension Level |
| ECM | Electronic Countermeasures |
| ECP | Engineering Change Proposal |
| EDC | Export Development Center |
| EDCOR | Economic Development Corps |
| EDD | Estimated Delivery Date |
| EEI | Essential Elements of Information |
| EIUI | End Item Use Inspection(s) |
| ELAT | English Language Aptitude Test |
| ELC | English Language Comprehension |
| Element | Air Force term for the basic fighting unit (two aircraft) |
| ELEX | Electronics |
| ELINT | Electronic Intelligence |
| ELMS | Elements |
| ELT | English Language Training |
| ELT/P | English Language Training/Program |
| EM | Enlisted Man/Men |
| Embtel/EMBTEL | Embassy Telegram |
| EMO | Equipment Management Office |
| En | Enemy |
| EN | Enlisted |
| Engr/ENGR | Engineer |
| ENSURE | Expediting Non-Standard Urgent Requirements for Equipment |
| EOD | Explosive Ordnance Demolition/Disposal |
| EOGB | Electro-Optically Guided Bomb |
| EOSM | Emergency On-Site Maintenance |
| EPC | Evacuation/Evacuee Processing Center |
| EPW | Enemy Prisoner of War |
| EQPT | Equipment |
| ER | Emergency Resupply |
| ERC | Electronic Repair Center |
| ERT | Equipment Retrograde Team |
| ESR | Equipment Status Report |
| ESSG | Engineer Strategic Study Group |
| EST | Establish/Estimate |
| EUSA | Eighth United States Army |
| EVAC | Evacuation |
| EWO | Electronic Warfare Officer |
| EXPL | Explosion |