a patch for columbine

15 years ago today, two columbine high school students killed a teacher and 12 fellow students in the worst high school massacre in us history.  the rockies wore a patch on their sleeves for the remainder of the 1999 season to honor the victims.  the patch, with the letters 'chs' for columbine high school, is visible on larry walker's 2000 pacific crown collection card

a few oakland a's (reggie jackson, ken holtzman, and mike epstein) wore a black armband in 1972 (unfortunately, i can't find any photos) following the murder of israeli athletes at the 1972 olympic games in munich, but i believe that this is the first time a memorial was worn by an entire team following a terroristic or similarly violent event.