Donald Slayton portrait. (Autograph removed and color corrected)
NASA; retouched <a href="//commons.wikimedia.org/wiki/User_talk:Coffeeandcrumbs" title="User talk:Coffeeandcrumbs">Coffeeandcrumbs</a>
1964
<a rel="nofollow" class="external free" href="https://www.nasa.gov/sites/default/files/atoms/files/hersch.pdf">https://www.nasa.gov/sites/default/files/atoms/files/hersch.pdf</a>