THE WALL OF FACES

Hospitalman Ivan Louis Heller was awarded the Bronze Star Medal for Valor, with Combat Distinguishing Device (V), for his exemplary gallantry in action. He served as a Hospitalman (Corpsman) and was assigned to H&S CO, 2ND BN, 5TH MARINES, 1ST MARDIV.
See https://marines.togetherweserved.com/
See also http://www.coffeltdatabase.org/detreq2.php

Do not stand at my grave and weep
I am not there. I do not sleep.
I am a thousand winds that blow.
I am the diamond glints on snow.
I am the sunlight on ripened grain.
I am the gentle autumn rain.
When you awaken in the morning's hush
I am the swift uplifting rush
Of quiet birds in circled flight.
I am the soft stars that shine at night.
Do not stand at my grave and cry;
I am not there. I did not die.

Hospitalman Ivan Louis Heller, Served with the Headquarters and Service Company, 2nd Battalion, 5th Marine Regiment, 1st Marine Division, Third Marine Amphibious Force.He was assigned to Company E, 2nd Battalion, 5th Marine Regiment, When He was Killed in Action.

You corpsmen were so brave.
I didn't see it mentioned, but you were awarded the Bronze Star with V for valor.
Semper Fi

I saw an article about a Vietnamese girl who found a card with his name in her backyard. I think this information will be useful to your family members.