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We are here to remember so that we never repeat the mistakes of the past,” NASA Administrator Bill Nelson told a gathering of more than 100 NASA employees, family members and friends at Arlington National Cemetery on Jan. 25, 2024, NASA’s annual Day of Remembrance. “Because of Apollo 1, Challenger and Columbia, we honor 17 souls deep in our hearts.” Traditionally held on the fourth Thursday in January, the NASA Day of Remembrance commemorates the crews of Apollo 1 and space shuttles Challenger and Columbia—all of whom are honored with monuments at ANC. The timing of the annual remembrance reflects the anniversaries of the three disasters, which happened to occur between the dates of Jan. 27 and Feb. 1.