Astronauts Memorial Foundation president and CEO Thad Altman (center) stands as the Brevard County Sheriff’s Office Honor Guard presents colors during NASA’s Day of Remembrance ceremony on Thursday, Jan. 22, 2026, at the Kennedy Space Center Visitor Complex in Florida. The crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other fallen astronauts who lost their lives in the name of space exploration and discovery, were honored by Kennedy employees and guests at the annual memorial event. This year marks the 40th anniversary of the Challenger tragedy.