The actual main character in the first six films of this series is Peter Stirling, played by Donald O’Connor. A second lieutenant in the Army in the first film, he later goes to West Point, joins the WACs, and in O’Connor’s final appearance serves in the Navy after a case of mistaken identity – always with assistance, rarely believed by others, from the title character. What title character, voiced by Chill Wills in the first six films, went on to appear in a seventh film with Mickey Rooney?
Francis (the Talking Mule)