Chairman of the Joint Chiefs of Staff Mike Mullen tweeted to commemorate the 10th anniversary of the bombing of the U.S.S. Cole on Tuesday.

"Thoughts and prayers today for the loved ones of the Sailors lost aboard USS COLE ten years ago. We cannot forget. We will not forget," he said.

The ship was refueling in southwestern Yemen in October 2000 when a small vessel approached it and blasted a 40-by-40-foot hole in its side, killing 17 and injuring 39.

Al-Qaeda took credit for the attack. A federal judge later ruled in a suit against Sudan by the families of Cole sailors that the attack could not have occurred without support for al-Qaeda from the Sudanese government.

President Obama later released a statement marking the anniversary.

"We pay tribute on this day to the courage and sacrifice of those who lost their lives in this attack, and to their families. We remain steadfast in our support for the brave men and women of our armed forces who continue to risk their lives around the world to defeat these terrorists and to keep our nation safe, and we stand with our military families who sacrifice so much to support them," he said.

"Al-Qaeda continues to use Yemen, as well as other places around the world, as platforms from which to pursue its murderous agenda, and we continue to work closely with our Yemeni and other global partners to counter the al-Qaeda threat.  As we do, we will always remember those we lost on the USS Cole, and we will honor their legacy of selfless service by advancing the values that they stood for throughout their lives." 

—This post was updated at 4:42 p.m.