Schulz threw satirical barbs at any number of topics when he chose. His child and animal characters satirized the adult world. Over the years he tackled everything from the Vietnam War to school dress codes to "New Math." One strip on May 20, 1962, even had an icon that stated "Defend Freedom, Buy US Savings Bonds." In 1963 he added a little boy named "5" to the cast, whose sisters were named "3" and "4," and whose father had changed their family name to their ZIP Code, giving in to the way numbers were taking over people's identities. In 1958, a strip in which Snoopy tossed Linus into the air and boasted that he was the first dog ever to launch a human parodied the hype associated with Sputnik 2's launch of Laika the dog into space earlier that year. Another sequence lampooned Little Leagues and "organized" play when all the neighborhood kids join snowman-building leagues and criticize Charlie Brown when he insists on building his own snowmen without leagues or coaches.