The Question and Answer section for Flags of Our Fathers is a great resource to ask questions, find answers, and discuss the novel.
Bradley believed that battlefield bravery had little to do with national allegiance-- and everything to do with friendship, comaraderie..... it's your buddies who count.
Doc learned to cut hair while studying to work in a funeral home. He practiced on dead bodies.
In Chapter Eight, we learn that the tanks that were supposed to precede the Marines in battle didn't show up because of problems refueling.