During this conflict, 464 United States military personnel received the Medal of Honor, 266 of them posthumously. A total of 42 Medals of Honor, representing 9% of all awarded during World War II, were presented for action in just two events;– 15 for actions during the Japanese attack on Pearl Harbor in peacetime, and 27 for actions during the Battle of Iwo Jima. A total of 21 (4.5% of all World War II Medals of Honor) were awarded to members of the all-Japanese American 100th Infantry Battalion of the 442nd Regimental Combat Team, for actions in numerous battles across six different campaigns. Additionally, the only Medal of Honor ever presented to a member of the United States Coast Guard was received for actions during this war.