Security mission or measure consisting in systematically observing space, land, air-sea surfaces and underwater areas, places, people or objects using visual, acoustic, electronic, photographic or other means, in order to detect any enemy activity at a location, in a direction or area in order to alert and to collect information. 2. Mission for the air defense artillery, consisting in taking part in the detection, identification and information collection on the air activity in a given air space.

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Security: 15 phrases in 7 subjects