421st Fighter Squadron emblem.  Approved 27 October 1977
<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>
1977-10-27
<a rel="nofollow" class="external free" href="https://media.defense.gov/2008/Mar/19/2000642826/-1/-1/0/080319-F-JZ511-678.JPG">https://media.defense.gov/2008/Mar/19/2000642826/-1/-1/0/080319-F-JZ511-678.JPG</a>