SAN FRANCISCO — Photographer Joe Rosenthal, who won a Pulitzer Prize for his immortal image of six World War II servicemen raising an American flag over battle-scarred Iwo Jima, died yesterday. He was 94.

Rosenthal died of natural causes at an assisted living facility in the San Francisco suburb of Novato, said his daughter, Anne Rosenthal.

"He was a good and honest man, he had real integrity," Anne Rosenthal said.

His photo, taken for The Associated Press on Feb. 23, 1945, became the model for the Iwo Jima Memorial near Arlington National Cemetery in Virginia. The memorial, dedicated in 1954 and known officially as the Marine Corps War Memorial, commemorates the Marines who died taking the Pacific island in World War II.

The Pacific War Memorial at Marine Corps Base Hawai'i in Kane'ohe, a 6,000-pound, 40-foot bronze and granite sculpture, is also based on Rosenthal's photo.

The photo was listed in 1999 at No. 68 on a New York University survey of 100 examples of the best journalism of the century.

The photo actually shows the second raising of the flag that day on Mount Suribachi on the Japanese island. The first flag had been deemed too small.

"What I see behind the photo is what it took to get up to those heights — the kind of devotion to their country that those young men had, and the sacrifices they made," Rosenthal once said. "I take some gratification in being a little part of what the U.S. stands for."

The small island of Iwo Jima was a strategic piece of land 750 miles south of Tokyo, and the United States wanted it to support long-range B-29 bombers and a possible invasion of Japan.

On Feb. 19, 1945, 30,000 Marines landed on the southeast coast. Mount Suribachi, at 546 feet the highest point on the island, took four days for the troops to scale. In all, more than 6,800 U.S. servicemen died in the five-week battle, and the 21,000-man Japanese defense force was virtually wiped out.

Ten years after the flag-raising, Rosenthal wrote that he almost didn't go up to the summit when he learned a flag had already been raised. He decided to up anyway, and found servicemen preparing to put up the second, larger flag.

"Out of the corner of my eye, I had seen the men start the flag up. I swung my camera and shot the scene. That is how the picture was taken, and when you take a picture like that, you don't come away saying you got a great shot. You don't know."

"Millions of Americans saw this picture five or six days before I did, and when I first heard about it, I had no idea what picture was meant."

He recalled that days later, when a colleague congratulated him on the picture, he thought he meant another, posed shot he had taken later that day, of Marines waving and cheering at the base of the flag.

He added that if he had posed the flag-raising picture, as some skeptics have suggested over the years, "I would, of course, have ruined it" by choosing fewer men and making sure their faces could be seen.

Standing near Rosenthal was Marine Sgt. Bill Genaust, the motion picture cameraman who filmed the same flag-raising. He was killed in combat just days later. A frame of Genaust's film is nearly identical to the Rosenthal photo.

The AP photo quickly became the subject war-bond drives and a U.S. postage stamp.

Rosenthal left the AP later in 1945 to join the San Francisco Chronicle, where he worked as a photographer for 35 years before retiring.

"He was short in stature but that was about it. He had a lot of nerve," said John O'Hara, a retired photographer who worked with Rosenthal at the San Francisco Chronicle.

In addition to his daughter, Rosenthal is survived by his ex-wife Lee Rosenthal, his son Joseph J. Rosenthal Jr., and their families.

Joe Rosenthal, snapped Iwo Jima photo