in 1917. He was stationed at the Great Lakes Naval Station north of Chicago. During two years of service, he played for the Naval Station's football, baseball, and basketball teams. He also took up boxing while in the Navy and won a championship in the middleweight division. He was the quarterback of the 1918 Great Lakes Navy Bluejackets football team that defeated previously undefeated Navy and then defeated the Mare Island Marines by a 17–0 score in the 1919 Rose Bowl. Conzelman's teammates on the 1918 Great Lakes team included George Halas and Paddy Driscoll, all three of whom were later inducted into the Pro Football Hall of Fame. After the war, Conzelman turned down offers to become a professional boxer and returned to Washington University in February 1919. He played for the 1919 Washington Pikers football team that compiled a 5–2 record and outscored opponents 127 to 30. Conzelman was selected as the All-Missouri Valley Conference quarterback for 1919. He also was the catcher for the 1920 Washington University baseball team and organized an orchestra, played banjo, and wrote songs while attending Washington University. During the spring semester of 1920, Conzelman lost his eligibility to play football due to academic deficiencies. His father had also died in May 1919, and he withdrew from school to help support his mother and younger siblings. In June 1920, Conzelman announced that he would not return to Washington University in the fall. He spent the summer leading an orchestra in Arkansas. Professional football player Decatur Staleys In mid-October 1920, Conzelman joined the Decatur Staleys (later renamed the Chicago Bears) of the newly formed American Professional Football Association (later renamed the NFL). He planned to relocate permanently to Decatur and also play for the Staleys baseball and basketball teams. Conzelman was reunited at Decatur with player-coach George Halas, with whom Conzelman had played on the 1918 Great Lakes team. In Conzelman's first game with the Staleys, he scored the game's only touchdown on a 43-yard run. Playing at the halfback position, Conzelman handled punting, placekicking and passing for the Staleys in the important games and was selected as a second-team player on the 1920 All-Pro team. The 1920 Staleys compiled a 10–1–2 record and finished in second place in the league. Rock Island Independents In October 1921, Conzelman joined the Rock Island Independents as the team's captain and coach. At age 23, he was