NASA employees, families and friends and Robert Lightfoot (right), acting administrator, NASA, bow their heads in a moment of silence at the graves of Apollo 1 crew members, Air Force Lt. Col. Virgil Grissom and Navy Lt. Cmdr. Roger Chaffee, in Arlington National Cemetery during NASA’s Day of Remembrance, Arlington, Virginia, Jan. 25, 2018. This annual event pays tribute “to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues who lost their lives while furthering the cause of exploration and discovery,” according to NASA. ( Army

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