“The identities of the flag raisers is something the Marine Corps has always been obligated to confirm, and the board findings do so,” Gen. David H. Berger of the Marine Corps wrote in a letter to Corporal Keller’s daughter last week.

The finding was reported Wednesday evening by NBC News.

Days after the photograph was captured on Feb. 23, 1945, during the battle of Iwo Jima, one of the bloodiest in World War II, it appeared on the front pages of major national newspapers. The scene has been engraved on stamps and memorialized in a sculpture near Arlington National Cemetery, which depicts six 32-foot-tall figures in the same positions as the men in the photograph.

Joe Rosenthal of The Associated Press won a Pulitzer Prize for the picture.

But the image has also generated scrutiny, including from those who have questioned whether the scene was staged. Mr. Rosenthal defended the photograph’s authenticity until his death in 2006. The Marines have fended off similar accusations.

In June 2016, the corps said that it had wrongly identified one of the men in the picture following an internal investigation that was opened in response to questions raised by producers working on the documentary “The Unknown Flag Raiser of Iwo Jima.”

The corps found in 2016 that a private first class, Harold Schultz, was one of the six men in the photograph. It also determined that a Navy hospital corpsman, John Bradley, whose son wrote a best-selling book about his father’s role in the flag-raising that was made into a movie directed by Clint Eastwood, was not in the image.