About 20 survivors attended the event at a grassy looking overlooking harbor and the USS Arizona Memorial.
Official brochures still list the wrong person as one of six men who took part in the iconic flag-raising at Iwo Jima.
Members of the Kansas-based Westboro Baptist Church challenged the law but have lost in lower courts.
Traditionally, wars had to be over before their names were added to the iconic Marine Corps memorial in Arlington, Va.
An airman attacked for appearing to take a knee in protest during a service was just feeling faint, Air Force officials said.