Ancestry.com is offering free access to its World War II records through Dec. 7.
The company says one in five Americans is a direct descendant of a World War II veteran while four out of five Americans are related to someone who served.
The documents include 33 million records from the Navy's Muster Rolls between 1939 and 1949. They detail all enlisted personnel who served aboard a Navy ship during that decade.
The company says nearly anyone with a family member enlisted in the Navy during this time should be able to find their records in this collection.
Ancestry.com Inc. said Friday it's offering free access in remembrance of the 70th anniversary of the attack on Pearl Harbor.