| 1. | These included 166 armoured UAV and 4 additional Britten-Norman Defender observation aircraft.
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| 2. | United States Air Force observation aircraft supports the Treaty on Open Skies.
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| 3. | *observation aircraft, joint venture between Aermacchi and Aeritalia, initially designated the MB-335.
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| 4. | On the last day of October, he shot down an LVG observation aircraft.
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| 5. | Soon afterwards, he attacks an Allied two-man observation aircraft, incapacitating the rear gunner.
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| 6. | The L-2 and L-3 Grasshopper light observation aircraft were also utilized.
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| 7. | After the Pearl Harbor attack on 7 December 1941, the O-49 Vigilant observation aircraft.
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| 8. | The Germans then became leery of firing on any of the khaki observation aircraft.
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| 9. | The Americans developed and made extensive use of the high-altitude observation aircraft for intelligence-gathering.
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| 10. | The OA-37B Dragonfly derivative was an armed observation aircraft developed during the Vietnam War.
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