Go to: CHALLENGER TRIBUTE NASA chief Sean O'Keefe lays a wreath at the Space Shuttle Challenger Memorial at Arlington National Cemetery on January 28, honoring Michael Smith, Dick Scobee, Ronald McNair, Ellison Onizuka, Christa McAuliffe, Gregory Jarvis and Judith Resnik, who died 17 years ago when the Challenger exploded shortly after launch. (01/29/03)