WW I poster USA World War I, American poster showing Liberty, and a Boy Scout holding a sword inscribed, "Be prepared." Original title: U*S*A Bonds - Third Liberty Loan Campaign - Boy Scouts of America Weapons for liberty. Artist: J.C. Leyendecker (1874-1951) Lithograph poster, color ; 76 x 51 cm. American Lithographic Company. New York 1917.