World War II: The <a href="https://en.wikipedia.org/wiki/Eighth_Air_Force" id="mwxA" rel="mw:WikiLink" title="Eighth Air Force">United States Eighth Air Force</a> loses 60 of 291 <a href="https://en.wikipedia.org/wiki/Boeing_B-17_Flying_Fortress" id="mwxQ" rel="mw:WikiLink" title="Boeing B-17 Flying Fortress">B-17 Flying Fortresses</a> during the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Second_Raid_on_Schweinfurt" id="mwxg" rel="mw:WikiLink" title="Second Raid on Schweinfurt">Second Raid on Schweinfurt</a>.