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CAPE CANAVERAL, Fla. – At the Kennedy Space Center Visitor Complex, Center Director Bob Cabana takes part in a ceremony paying tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues, during NASA's Day of Remembrance observance Jan. 29. The public was invited to the wreath-laying ceremony in front of the Space Mirror Memorial, on which are engraved the names of NASA's heroes who lost their lives while furthering the cause of exploration and discovery. Photo credit: NASA/Kim Shiflett