FDR did not contract polio until 1921, after World War I. He was 16 when the Spanish-American War started and planned to run off with a couple of classmates to join the Navy, but they came down with scarlet fever and had to give up the plan.
During WWI he was assistant secretary of the Navy and requested active duty, but President Wilson insisted that he remain at his position. He did tour the battle zones during the war.
Source: William DeGregorio, The Complete Book of U.S. Presidents
Good Grief, you must have an extensive library. thanks for the info.