The emblem shown in the picture appears on which US military memorial that depicts an event in WWII?

I had a substitute teacher, an immigrant from Sweden, who joined the Marines by lying about his age. He was sixteen. He shared his experience landing on Iwo Jima--the volcanic was so fine that it rendered their efforts to low-crawl up the beach. He's said it took all day to get up there. There was more, but it got rather sobering.