In 1979, the March of Dimes incorporated TeamWalk, inviting participation by teams of employees from other corporations, into the March for Babies strategy. On April 26, 1981, the foundation held the first walk occurring nationally on the same day billed as WalkAmerica and has since kept the tradition of holding the event on the last weekend in April. In 1991, Lee Iacocca, Chairman of the Chrysler Corporation, was the Honorary National March for Babies chairman. With increasing sophistication in promotion and marketing, each campaign was given a theme (and slogan) that merged fund-raising and mission objectives. Experience WalkAmerica was the campaign in 1991, followed by Walk for Healthier Babies (1993), Walk for Someone You Love (1995), and Be A Hero for the Tiniest Babies (2002) among others. March for Babies advertising and promotional literature thus became standardized around mission-related themes of perinatal health.