The bombing of Pearl Harbor 83 years ago launched the United States into World War II. Two survivors returned to the Hawaii military base on Saturday for a remembrance ceremony on the attack's anniversary. Both are over 100 years old. They joined active-duty troops, veterans and members of the public for an observance hosted by the Navy and the National Park Service. A third survivor was planning to join them but had to cancel due to health issues. The bombing killed more than 2,300 U.S. servicemen.