WW I poster USA World War I, American recruitment poster showing Uncle Sam brandishing a quill pen before a cheering crowd. Original title: Register June 5th. "A great day of patriotic devotion and obligation." - Woodrow Wilson. Artist: Arthur William Colen Lithograph poster, color ; 89 x 57 cm. Philadelphia: Committee of Public Safety of Pennsylvania, Department of Military Service, the Colonial Press. Philadelphia 1917.