General Mark Clark was one of the great heroes of WWII. He led the Salerno invasion that Winston Churchill said was "the most daring amphibious operation we have launched, or which, I think, has ever been launched on a similar scale in war." At the time Clark was promoted to Lt. General; he was the youngest man of that rank in the U.S. Army. He graduated from West Point in 1917. At the top of his class? Nope. He was 111th from the top in a class of 139!

Even if you never earned a college degree, don't worry, you're in good company. Irving Berlin, for instance, only had two years of formal schooling. He never learned how to read music. When he composed his songs, he would hum the melody and a musical secretary would write down the notes. He became one of the greatest songwriters the country has ever known.