51st Fighter Group emblem.  Approved 5 February 1942.
<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>
1942-02-05
<a rel="nofollow" class="external free" href="https://media.defense.gov/2007/Jan/25/2000519650/-1/-1/0/070125-F-JZ504-801.JPG">https://media.defense.gov/2007/Jan/25/2000519650/-1/-1/0/070125-F-JZ504-801.JPG</a>