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| secrecy discipline; field security; secrecy | |||
| обеспечение скрытности: 101 phrase in 12 subjects |
| Astronautics | 1 |
| Aviation | 1 |
| Electronics | 2 |
| Foreign affairs | 1 |
| Information security and data protection | 1 |
| Military | 89 |
| Nautical | 1 |
| Navy | 1 |
| Security systems | 1 |
| Technology | 1 |
| Telecommunications | 1 |
| Torpedoes | 1 |