Which war advertisement uses the celebrity or beautiful people propaganda technique to convince people to join the army? This World War II advertisement shows Uncle Sam with the caption “I Want You for the US Army." This World War II advertisement shows the famous boxer Joe Louis with the caption “We’re going to do our part . . . .” This World War II advertisement shows a British man with the caption “This man is your friend." This Army Air Force advertisement shows an Air Force officer with the caption “O’er the ramparts we watch."