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