From 1944 through 1946 he served in the United States Navy as a Lieutenant. While in service he was temporarily replaced on the Benny radio program by fellow tenor Larry Stevens. On his return to civilian life, he continued to work with Benny while also starring on his own NBC show, "A Day in the Life of Dennis Day" (1946–1951). On Benny's show, Day's having two programs in comparison to Benny's one was the subject of numerous jokes and gags, usually revolving around Day rubbing Benny's, and sometimes other cast members' and guest stars' noses in that fact (e.g., "Dennis, why do you have two horns on your bicycle?" "Why shouldn't I? I've got two shows!"). His last radio series was a comedy and variety show that aired on NBC's Sunday afternoon schedule during the 1954–55 season.