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May 1942. Marines training in barrage balloon technique at Parris Island, South Carolina. View full size. 4x5 Kodachrome transparency by Alfred Palmer.
They ensure that the balloon is always facing into the wind.
Why does a barrage balloon need tailfins? It appears that it will be moored to maintain a certain orientation, so tail fins would only act to make it move from that orientation whenever the wind was blowing in a different direction.
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