| 342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
| 13 | ![]() | RADAR EW (ELECTRONIC WARFARE) {3} |
| 14 | DF | .~> ECM (Electronic countermeasures, i.e., jamming) {1} |
| 16 | DF | .~> ECCM (Electronic counter-countermeasures, i.e., antijamming) {1} |
| 20 | DF | .~> Detection of surveilance |