Because the yanks would never do that.
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In total, there were 35 American balloon companies in France during World War I; they ascended 5,866 times, adding up to 6,832 hours in the air. Their balloons were attacked 89 times; 35 burned, 12 were shot down by enemy fire and one floated into enemy lines. Of all 116 parachute jumps from balloons, the parachutes – made of silk – never failed to open, though one observer lost his life when pieces of a burning balloon fell on his descending parachute. The reconnaissance of these balloon observers was invaluable, sighting thousands of instances of enemy planes, infantry and artillery fire.
Like it did for tanks and gas masks, the First World War spurred scientists and engineers to make advancements in the field of “lighter-than-air” technology – balloons.
www.theworldwar.org