| CFO | Chief Financial Officer |
| CNS | Consolidated Nuclear Security |
| CO | Contracting Officer |
| COR | Contracting Officer’s Representative |
| DoD | Department of Defense |
| DOE | Department of Energy |
| FFRDC | federally funded research and development center |
| FY | fiscal year |
| LANL | Los Alamos National Laboratory |
| LDRD | Laboratory Directed Research and Development |
| LEP | life-extension program |
| LLNL | Lawrence Livermore National Laboratory |
| M&O | management and operating |
| NA-10 | NNSA Office of Defense Programs |
| NA-19 | NNSA Office of Production Modernization |
| NA-20 | NNSA Office of Defense Nuclear Nonproliferation |
| NA-50 | NNSA Office of Safety, Infrastructure, and Operations |
| NA-70 | NNSA Office of Defense Nuclear Security |
| NA-80 | NNSA Office of Counterterrorism and Counterproliferation |
| NA-191 | NNSA Plutonium Program Office |
| NA-APM | NNSA Office of Acquisition and Project Management |
| NA-EA | NNSA Office of External Affairs |
| NA-MB | NNSA Office of Management and Budget |
| NAPA | National Academy of Public Administration |
| NDAA | National Defense Authorization Act |
| NNSA | National Nuclear Security Administration |
| OMB | Office of Management and Budget |
| PAS | Presidential appointment subject to Senate confirmation |
| PPBE | planning, programing, budgeting, and evaluation |
| R&D | research and development |
| S&E | science and engineering |
| SES | Senior Executive Service |
| SIAP | Site Integrated Assessment Plan |
| SNL | Sandia National Laboratories |
| WBS | work breakdown structure |