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You guys probably already know this about Arness, but why not remember anyway (from Wiki):

Although Arness wanted to be a naval fighter pilot, he was concerned his poor eyesight would bar him. However, his 6 feet 7 inches (2.01 m) frame ended his chances because the limit for aviators was set at 6 feet 2 inches (1.88 m). He was drafted into the US Army and reported to Fort Snelling, Minnesota, in March 1943.[3] As a rifleman, he landed on Anzio Beachhead on January 22, 1944, with the 2nd Platoon, E Company, 2nd Battalion, 7th Infantry Regiment of the 3rd Infantry Division. Arness – due to his height – was the first man to be ordered off his landing craft to determine the depth of the water; it came up to his waist.[3] He was severely wounded in his right leg during the Battle of Anzio,[5][6] and medically evacuated from Italy to the U.S., where he was sent to the 91st General Hospital in Clinton, Iowa. His brother, Peter, (later known as actor Peter Graves), came to see him when he was back in the U.S., beginning his long recuperation, assuring him to not worry about his injuries, that there would likely be work for him in the field of radio. After undergoing several surgeries, he was honorably discharged from the Army on January 29, 1945.[7] However, his wounds continued to trouble him throughout the remainder of his life. In his latter years he suffered with chronic leg pain that often became acute, and was sometimes initiated when he was mounted on horses during his performances on Gunsmoke.[8][6] His military decorations included the Bronze Star, the Purple Heart, the European-African-Middle Eastern Campaign Medal with three bronze battle stars, the World War II Victory Medal, and the Combat Infantryman Badge.