500th Bombardment Squadron emblem.  Approved 13 May 1943.  Although this was the approved emblem for the squadron during World War II, after it moved overseas, it used a different emblem that was not approved until 1954.
<a href="https://en.wikipedia.org/wiki/United_States_Army_Institute_of_Heraldry" class="extiw" title="en:United States Army Institute of Heraldry">en:United States Army Institute of Heraldry</a>
1943-05-13
<a rel="nofollow" class="external free" href="https://www.ebay.com/itm/E2583-WW2-US-Army-Air-Force-500-Bombardment-Squadron-345th-Bomb-Group-R25B/383012652157">https://www.ebay.com/itm/E2583-WW2-US-Army-Air-Force-500-Bombardment-Squadron-345th-Bomb-Group-R25B/383012652157</a> edited with Microsoft Paint