The United States naval base at Pearl Harbor was surprised by a Japanese military strike on the morning of December 7, 1941. All eight U.S. Navy battleships were damaged and more than 2,000 Americans were killed. This attack led to American involvement in World War II. Now a memorial stands erect for those who died in the assault. It includes exhibits and interpretive programs for other Pacific National Parks: World War II Valor at Pearl Harbor, Kalaupapa National Historical Park on the island of Molokai, American Memorial Park in Saipan, and War in the Pacific National Historical Park in Guam.