Sunday marked the 84th anniversary of the Pearl Harbor bombing — a shocking attack that killed 24-hundred Americans, including more than 11,000 aboard the USS Arizona.

The US Navy, in coordination with the Pearl Harbor National Memorial, removed significant portions of two World War II-era mooring platforms from the USS Arizona in October to help preserve the historic ship.

Visitors tour the USS Arizona Memorial at the Pearl Harbor National Memorial on Oct. 6 in Joint Base Pearl Harbor-Hickam on Oahu, Hawaii, shortly after the U.S. Navy completed removal of historic World War II salvage platforms.

Sunday is Pearl Harbor Remembrance Day, marking nearly 85 years since the USS Arizona was sunk, on a day that President Franklin D. Roosevelt said would “live in infamy.” And, it turns out, the ship has been leaking oil since that time.

Survivors of the 1941 Japanese bombing of Pearl Harbor have long been the center of a remembrance ceremony held each year on the military base’s waterfront.

Operation 85, a family advocacy group, has worked tirelessly the past two years to obtain the DNA of 643 descendents of those onboard the USS Arizona.

Volunteers with Operation 85 have obtained 1,400 DNA samples from potential relatives of the Arizona to help identify crew members.

A Green Valley retiree is among those who submitted DNA samples that could soon be used to help identify USS Arizona servicemen buried as unknowns.