 |
| |||
| PD | |||
| PD (Air Force) | |||
| PD (or Directive) | |||
| program: 33 phrases in 12 subjects |
| Abbreviation | 6 |
| Computer networks | 1 |
| Education | 5 |
| Electronics | 1 |
| Information technology | 2 |
| Law | 1 |
| Military | 10 |
| Oceanography & oceanology | 2 |
| Programming | 1 |
| Software | 1 |
| Telecommunications | 2 |
| United Nations | 1 |