Hello John:
Thanks for posting this reminder of one of the most savage battles in American history and of the valor displayed by thousands of Marines in wresting that island from a determined enemy. The battle, the Rosenthal picture and the Iwo Jima Monument based on the photo are deeply engrained in the collective memory of Americans, as they should be.
I have been to the Monument myself a couple of times. My Dad, who spent WW2 as a pilot in the USAAF, took me when I was but a small boy. I never forgot that experience. I returned many years later with my nephew, then an active duty Marine stationed at Eighth and I in Washington, DC. I, too, have read the Bradley book and seen the films mentioned above and many others on the battle and the participants. One would need to have a heart of stone to not be moved by the courage and sacrifice of the Marines on Iwo, as perfectly exemplified in the flag raisers' image.
I am a little surprised that no one has mentioned this yet. The teacher's story you related focused on an encounter at the Monument with John Bradley, the son of the Navy Corpsman then believed to have have been one of the flag raisers. Meticulous research conducted in recent years has led to a change in the identification of the flag raisers immortalized in the Rosenthal photo. They are now recognized to have been Corporal Harlon Block, PFC Rene Gagnon, PFC Ira Hayes, PFC Harold Schultz, PFC Franklin Sousley, and Sgt. Mike Strank.
It turns out that Pharmacist Mate John Bradley was not one of the flag raisers in the Rosenthal image, although he was present on Suribachi and was probably part of the group that raised the first, smaller flag. That latter fact may explain in part how Bradley got swept up and celebrated as one of the six flag raisers in the photo, and perhaps sheds light on his well known reticence to speak of the ordeal in later years.
In 2016 the U.S. Marine Corps issued an official statement correcting the historical record to properly identify the six in the Rosenthal image. In doing so the Marine Corps took great pains to emphasize the courage and fighting spirit of ALL of the Marines on Iwo as symbolized by the Monument. The official statement of the Marine Corps on this issue can be found at this link:
USMC statement on Iwo Jima flag raisers > United States Marine Corps Flagship > News Display
It has been said that in a sense one never truly dies if one lives on in the hearts of their countrymen. As a country we seem to have lost a lot of our collective memory, but I think it remains true that the heroism, devotion to duty and sacrifice of the Marines at Iwo Jima 76 years ago is still remembered, revered and is a source of national pride.