| Abbreviation | Definition |
|---|---|
| MER | Maintenance Evaluation Report |
| MER | Manpower Estimate Report |
| MER | Minimum Engagement Range |
| MERC | Mercenary |
| MERC | Mobility Enhancing Ration Component |
| MERCO | Merchant Ship Reporting and Control |
| MERCURY | Automated Sanitizer and Translator for Formatted Text/Data |
| MERG | Military Employee Resource Group |
| MERLIN | Multi Element Radio Linked Interfometer Network |
| MERSHIPS | Merchant Ships |
| MERT | medical emergency response team |
| MES | Management Excecution System |
| MES | Medical Equipment Set |
| MES | Military Experimental Subject |
| MES | Mine Effects Simulator |
| MESA | Medical Equipment Supplies Abroad |
| MESA | MOLLE Enhanced South African assault vest |
| MESAR | Minimum-Essential Security Assistance Requirements |
| MESAR | Multi-functional Electronic Scanned Adaptive Radar |
| MESD | Management Employment Services Division |