By Catherine Welch
Providence, R.I. – The Naval War College is holding a memorial ceremony Friday to remember those who died on 9/11. Three war college students and seven alumni died in the 2001 attack on the Pentagon. Hijackers flew an American Airlines plane into the western side of the Pentagon killing everyone on board and 125 people inside the building. The ceremony will be held at the Naval War College's 9/11 Memorial, which includes a piece of shattered limestone that was part of the Pentagon.