Emblem of the 424th Bombardment Squadron (World War II)
United States Air Force
1942
United States Air Force via Maurer, Maurer. Combat Squadrons of the Air Force, World War II. Maxwell AFB, Alabama: Air Force Historical Studies Office, 1969. <a href="//commons.wikimedia.org/wiki/Special:BookSources/0-89201-097-5" title="Special:BookSources/0-89201-097-5">ISBN 0-89201-097-5</a>.