On March 26, 1945, when the island was declared secured, 6,812 Americans (10%) were dead or missing, and an additional 19,217 (27%) had been wounded. Of the defending Japanese force, only 217 were captured. The remaining 21,844 (99%) were killed.
27 Medals of Honor were awarded (13 posthumously) - over one-fourth of all the MOHs awarded to Marines in all of WWII.
I recently had the honor of meeting an Iwo Jima survivor at an assisted living facility. He summed it up this way: "The Japs would not surrender. They wouldn't come out of their caves. So, we burned them out with our flamethrowers, then shot them with our rifles. It was awful".
The picture I've included is not the one you might expect - the flag-raising on Mt. Suribachi. Rather, it is a landing craft of "average" Marines, most in their 20's, throwing themselves into the raging inferno, despite their fears and trepidations. Home must have seemed like a distant planet. We owe them everything.