| 1. | Though effective against ships, the guns were vulnerable to aerial observation attack.
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| 2. | Otherwise, troops will man checkpoints and surveillance stations, and conduct aerial observation.
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| 3. | Dense tropical rain forest covers the entire area, almost frustrating aerial observation.
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| 4. | Otherwise, peace-enforcing troops will man checkpoints and surveillance stations and conduct aerial observation.
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| 5. | Then, did the Israeli gunners have aerial observation of the fall of shot?
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| 6. | Otherwise, peace-enforcing troops will man checkpoints and surveillance stations, and conduct aerial observation.
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| 7. | The school used balloons and fixed wing aircraft for aerial observation.
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| 8. | Surrounding terrain can be surveyed with aerial observation units and radar.
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| 9. | The aerial observation units at the disposal of the III Corps were adequate.
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| 10. | These winds created much havoc with the aerial observation, ground training, and balloon handling.
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