John Mosley came to Colorado State as a National Merit Scholar from Denver's Manuel High School in the fall of 1939. He decided that he wanted to try out for the football team as a freshman and in doing so became the first African American football player at Colorado State since 1906. Mosley also decided he would wrestle for Coach Hans Wagner becoming the first African American wrestler in school and state history. Mosley earned all-conference honors in wrestling. In football he lettered for three years becoming the first African American letter winner in CSU football history.
Following graduation, Mosley set his sights on flying and trained himself to be a pilot so he could fly for the Army Air Corps. He enrolled in the Tuskegee Flight training center and became one of the first African American pilots of bombers in US history. Mosley fought as a bomber pilot in both the Korean and Vietnam Wars, retiring as a Lt. Col in the United States Air Force. Since retirement, Mosley has become a spokesperson for black athletes and the Tuskegee Airmen that first flew African American pilots during WWII.