Where did the saying of happy camper come from?

The phrase "happy camper" originated in the United States, likely in the mid-20th century, and is associated with the camping culture that became popular during that time. It refers to someone who is content and satisfied, often used in a playful or ironic context. The phrase gained wider usage in the 1980s and 1990s, particularly in pop culture and media, to describe individuals who are pleased with their circumstances or experiences.