HARRISBURG – National Pearl Harbor Remembrance Day is observed annually in the United States today to remember and honor the 2,403 U.S. citizens who were killed in the Japanese surprise attack on Pearl Harbor in Hawaii on December 7, 1941, which led to the United States declaring war on Japan the next day and thus entering World War II. On Pearl Harbor Day, the American flag should be flown at half-staff until sunset to honor those who died as a result of the attack. Some organizations plan to hold special events in memory of those killed or injured at Pearl Harbor.