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At the time of the attack on Pearl Harbor this was the official Army Air Force insignia. As the war progressed there was growing concern that the red dot could be mistaken, in the heat of battle, for the Japanese insignia called a "meatball" by allied forces. On May 12, 1942 the red dot was ordered removed. |
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After awhile it was discovered that the circle with just a white star was still a problem. At a distance under certain light and reflection conditions the white star was hard to see and the insignia appeared as a solid circle which could still be mistaken for a Japanese "meatball". |
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And so the white and blue bars were added which effectively eliminated the problem **. This version continues in use today. |
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** Sometimes seen without a border around the white bars or with a red border all around. |
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** Or with a yellow border around the circle (generally only in the Mediterranean- African theater). |
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