What is Ishmael Chambers' war experience?

Ishmael's brief war experience is outlined in Chapter 16. 
His childhood and high school romance with Hatsue ends abruptly when her family is sent
with the other Japanese Americans to an internment camp.  He joins the Marines just a
few months later in the summer of 1942.  He first trains as a rifleman in South Carolina
then later becomes a radio operator in New Zealand.  He is part of the group aboard the
USS Heywood which stormed the island of Betio in Southeast Asia.  While many men around
him are attacking and quickly dying, Ishmael waits behind a seawall for night to fall. 
When he does emerge, with a small group of unharmed soldiers, his left arm is
immediately shot.  He goes in and out of consciousness, but ultimately wakes aboard a
ship and knows his left arm has been amputated.  His final thought and statement is one
of confused rage and hatred against Hatsue.