| REC'S | Recommendations 
| Others |
| REC(s) | Regional Extension Center(s)
| Others |
| RECS | Race Environment Construction System
| Others |
| RECS | Radio Electronic Combat Support
| Others |
| RECS | Radiological Emergency Communications System
| Others |
| RECS | Rational Expectations Complementarity Solver
| Others |
| RECS | Re Engineered Composite System
| Others |
| RECS | Real Estate and Construction Services
| Others |
| RECS | Real Estate Cyberspace Specialist
| Others |
| RECS | Realistic Enviroment and Climate Simulator
| Others |
| RECS | Records
| Others |
| RECS | Reimagining Email Calendaring and Storage
| Others |
| RECS | Renewable Energy Certificate System
| Others |
| RECS | Representative Shuttle Environmental Control System
| Others |
| RECS | Research and Extension Center System
| Others |
| RECS | Research Education for College Students
| Others |
| RECS | Research Experience in Carbon Sequestration
| Others |
| RECS | Residential Energy Consumption Survey
| Others |