Over the years, some folks claimed the shot had been posed. But it was quite real. There is even video of the raising as well. http://en.wikipedia.org/wiki/Raising_the_Flag_on_Iwo_Jima
Another point often missed: Of the six men picturedMichael Strank, Rene Gagnon, Ira Hayes, Franklin Sousley, John Bradley (the Navy corpsman), and Harlon Blockonly three (Hayes, Gagnon, and Bradley) survived the battle.
R.I.P.
Ah yes, that's too often forgotten. I'd even forgot about that point, myself. R.I.P. to all of our brave service men who lost their lives on Iwo Jima and elsewhere.
Michael Strank, Ira Hayes and Rene Gagnon are buried in Arlington Nat'l Cemetery, got to see 'em myself. It's a shame most people only visit JFK.