Private Addison is one of the most prolific members of the so-called Barracks 3 gang - those who support Hogan and his men in their operations. He can be seen in almost every episode, usually doing something in the background. He has full knowledge of the doings of Hogan and his men, and has helped them on many occasions. Addison has even appeared at least once in German uniform as a camp guard, although neither Klink nor Schultz seemed to have noticed.