The Question and Answer section for Flags of Our Fathers is a great resource to ask questions, find answers, and discuss the novel.
For a detailed look at this topic, check out GradeSaver's theme page. Pay special attention to "The Misguided Media" and "Perception vs. Reality".
For a complete and detailed answer to your question, check out Gradesaver's analysis for Section Two of the book. It has everything you need to formulate an answer.
The Japanese were into mass suicidal attacks where as the Americans were not. The Japanese soldiers were loyal to their Emperor where as the American soldiers were loyal to their unit. The culture between the two countries was vastly different....