Inouye, along with his family, immigrants from Japan, was interned by the United States during WWII, but he volunteered to serve in the U.S. Army where he served in Italy and was awarded the Medal of Honor for an action in which he lost his right arm. Here is the official citation.
"Second Lieutenant Daniel K. Inouye distinguished himself by extraordinary heroism in action on 21 April 1945, in the vicinity of San Terenzo, Italy. While attacking a defended ridge guarding an important road junction, Second Lieutenant Inouye skillfully directed his platoon through a hail of automatic weapon and small arms fire, in a swift enveloping movement that resulted in the capture of an artillery and mortar post and brought his men to within 40 yards of the hostile force. Emplaced in bunkers and rock formations, the enemy halted the advance with crossfire from three machine guns. With complete disregard for his personal safety, Second Lieutenant Inouye crawled up the treacherous slope to within five yards of the nearest machine gun and hurled two grenades, destroying the emplacement. Before the enemy could retaliate, he stood up and neutralized a second machine gun nest. Although wounded by a sniper’s bullet, he continued to engage other hostile positions at close range until an exploding grenade shattered his right arm. Despite the intense pain, he refused evacuation and continued to direct his platoon until enemy resistance was broken and his men were again deployed in defensive positions. In the attack, 25 enemy soldiers were killed and eight others captured. By his gallant, aggressive tactics and by his indomitable leadership, Second Lieutenant Inouye enabled his platoon to advance through formidable resistance, and was instrumental in the capture of the ridge. Second Lieutenant Inouye’s extraordinary heroism and devotion to duty are in keeping with the highest traditions of military service and reflect great credit on him, his unit, and the United States Army."Now read this for a little more detail:
"I looked at it, stunned and disbelieving. It dangled there by a few bloody shreds of tissue, my grenade still clenched in a fist that suddenly didn't belong to me anymore," Inouye wrote in his 1967 autobiography, "Journey to Washington," written with Lawrence Elliott.R.I.P.
Inouye wrote that he pried the grenade out of his right hand and threw it at the German gunman, who was killed by the explosion. He continued firing his gun until he was shot in the right leg and knocked down the hillside. Badly wounded, he ordered his men to keep attacking and they took the ridge from the enemy.