With World War II and the threat of being drafted, Travis enlisted in the US Marine Corps. His stint as a Marine was very brief, and he returned to Cincinnati. When the Drifting Pioneers left radio station WLW, leaving a half-hour hole in the schedule that needed filling, Merle, Grandpa Jones and the Delmore Brothers formed a gospel group called "The Brown's Ferry Four". Performing a repertoire of traditional white and black gospel songs, with Merle singing bass, they became one of the most popular country gospel groups of the time, recording nearly four dozen sides for the King label between 1946 and 1952. The Brown's Ferry Four has been called "possibly the best white gospel group ever."