In 1941, Fox attempted to broaden Grable's acting and audience range by casting her in two films with more serious intent than those in which she had starred previously. The first, "A Yank in the R.A.F.", released in September, co-starred heartthrob Tyrone Power, and cast her as Carol Brown, who works in the Women's Auxiliary Air Force during the day, but is employed as a nightclub singer in the evening. The film followed the lines of other movies of the era, but it was not considered a propaganda movie by the studio. At the time of its release, the film received positive reviews, with many critics singling out the obvious on-screen chemistry between Grable and Power. It was a major box-office success, becoming the fourth-most popular movie of the year.