| Acronym | Meaning |
| IRR | Integrated Requirements Review |
| FSDR | Final System Design Review |
| CCARS | Computer Controlled Automatic Rain Sampler |
| QPF | Quantitative Precipitation Forecasting |
| ASTIA | Armed Services Technical Information Agency |
| APR | Aberdeen Pulsed Reactor Facility |
| UT / LS | Upper Troposphere/ Lower Stratosphere |
| ACS | American Chemical Society |
| ANL-E | Argonne National Laboratory-East |
| M&O | Maintenance And Operations |