April 21. 1918: Baron Manfred von Richthofen, the notorious German flying ace known as the Red Baron, is shot down and killed above the Somme River in France.
The Red Baron downed 80 enemy aircraft and went down in history as one of the greatest heroes to emerge from WWI on either side of the conflict. He was 25 years old at the time of his death.
Photo: Underwood Archives/Getty
April 18, 1942: The Tokyo Raid
Photo: NY Daily News
April 17, 1970: Apollo 13, a U.S. lunar spacecraft that suffered a severe malfunction on its journey to the moon, safely returns to Earth.
Photo: Apollo 13 astronauts treading water as they await their recovery helicopter (NASA/Time & Life Pictures)