Astronauts' Day of Remembrance.
Astronomy Magazine Article: NASA honors fallen astronauts with Day of Remembrance.
This year (2019) on February 7, the United States will recognize astronauts who lost their lives in the pursuit of spaceflight with an official Day of Remembrance.
On January 27, 1967, a fire broke out at the Apollo 1 launchpad, killing astronauts Gus Grissom, Ed White, and Roger Chaffee.
On January 28, 1986, the space shuttle Challenger exploded just after liftoff, killing all seven crewmembers, including Mission Specialist Ellison S. Onizuka, Pilot Michael J. Smith, Payload Specialist Christa McAuliffe, Commander Francis R. Scobee, Payload Specialist Gregory B. Jarvis, Mission Specialist Judith A. Resnik, and Mission Specialist Ronald E. McNair.
On February 1, 2003, the space shuttle Columbia broke apart on re-entry, killing all seven crewmembers, including Mission Specialist 1 David M. Brown, Commander Rick D. Husband, Mission Specialist 4 Laurel Blair Salton Clark, Mission Specialist 2 Kalpana Chawla, Payload Commander Michael P. Anderson, Pilot William C. McCool, and Payload Specialist 1 Ilan Ramon.
These were my heroes. May they rest in peace.