In a 77-day battle, some 6,000 Marines defended a small combat base from tens of thousands of North Vietnamese troops.
A total of 1.2 million wreaths are being placed on markers across the country in 1,238 locations.
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.
The government recently held a groundbreaking ceremony for the new Eisenhower Memorial on the National Mall.
In parks, war memorials, and on streets across the United States, people gathered to thank America's veterans.
The soil of France was used Thursday for the groundbreaking ceremony of a new World War I Memorial in Washington.