Jean Ruth was an American actress and radio personality. As an actress, she is best known for appearing in the Martin and Lewis film At War with the Army (1950). Her radio broadcasts during WWII from 1941-44 were the basis for the musical film Reveille with Beverly. She claimed later that while broadcasting she would be asked to read out the titles of songs that didn't exist, which served as secret messages to the French Resistance. She also later befriended the famous wartime Japanese-American radio announcer Iva Toguri after she was prosecuted for treason for radio broadcasts from Tokyo. She was married to American swing and boogie-woogie pianist and bandleader Freddie Slack from 1945 to 1948.

At War with the Army is a 1950 American musical comedy film directed by Hal Walker, released by Paramount, starring the comedy team of Martin and Lewis and introducing Polly Bergen. Filmed from July through August 1949, the film premiered in San Francisco on New Year's Eve 1950, before opening nationwide on January 17, 1951. It was re-released in 1958 by OMAT Pictures.