Pearl Harbor Day Dec. 7, 2011, marks the 70th anniversary of the attack by the Japanese on the American naval base at Pearl Harbor, Hawaii. The bombing of Pearl Harbor led to the U.S. entering World War II, as President Roosevelt declared it a date which will live in infamy.

On Wednesday about 120 survivors will join Navy Secretary Ray Mabus, military leaders and civilians for a moment of silence at Pearl Harbor in Honolulu, Hawaii, at 7:55 a.m. to commemorate the event and honor the dead. This time marks the exact moment when Japanese planes began their attack on Dec. 7, 1941. About 3,000 people are expected to attend today's services at a site overlooking the sunken USS Arizona.

F-22 jets flown by the Hawaii National Guard will fly overhead in a missing man formation, reports Mal Middlesworth, a Marine vet who was on the USS San Francisco at the time of the bombing, is scheduled the keynote address. The ashes of five survivors will be scattered during five ceremonies this week as well.

President Obama has declared Wednesday National Pearl Harbor Remembrance Day. And he had some words for the Greatest Generation of Americans.

Their tenacity helped define the Greatest Generation and their valor fortified all who served during World War II. As a nation, we look to December 7, 1941, to draw strength from the example set by these patriots and to honor all who have sacrificed for our freedoms, he said.

On that day in 1941, the Japanese attacked the U.S. with 353 fights, bombers and torpedo planes; and 2,402 Americans were killed. The attack was unprecedented and came as a shock. On Dec. 8, the U.S. declared war on Japan.

The WWII generation defeated both Nazism and Fascism, ridding the world of some of the greatest evils.

Eric Golub of The Washington Times cited a quote from Winston Churchill to sum it up: Americans can be counted on to do the right thing, after they have exhausted all other options.

Take a look back at photos from that infamous day and photos of some of the survivors today.