I read that tomorrow, Pearl Harbor Day, calls for flags to be displayed at half mast. Our flag that we display on a short pole at our home can't be lowered or raised. I also read that I can put a black mourning ribbon on a permanently fixed flag for half-mast days. Is Pearl Harbor Day a half-mast day, and where would I find a "mourning ribbon"? And if flags are flying at half mast now for Nelson Mandela, does that supersede Pearl Harbor Day somehow?