During World War II, the 442nd Regimental Combat Team, 100th Infantry Battalion, and Military Intelligence Service were formed as three U.S. military units composed of Japanese-American young men from the U.S. mainland, Hawaii, and ten internment camps such as Topaz. Despite heated racial attitudes, many volunteered to show loyalty to their country, and their valor and fighting spirit became known throughout the U.S. military. Their rescue of the Lost Battalion in France typified their bravery, as in fierce combat they suffered huge casualties, with 199 killed in action or missing and hundreds wounded in action, while rescuing 211 men of the Texas Battalion. During the war they received over 16,000 decorations, becoming the most decorated unit for its size and length of service in U.S. military history. However, only a single Congressional Medal of Honor was awarded because of racial overtones. This was corrected in 2000, when President Clinton upgraded 20 Distinguished Silver Cross Medals to Congressional Medal of Honor awards for 20 Japanese-American veterans, many of them in their 80s, with some awards given posthumously.