What new deal program put 3 million work men to work building trails in the national parks?

The Civilian Conservation Corps (CCC) was a New Deal program established during the Great Depression that employed approximately 3 million young men to work on various environmental projects, including building trails in national parks. Launched in 1933, the CCC focused on conservation efforts, reforestation, and the development of public lands, significantly contributing to the infrastructure and preservation of the nation's Natural Resources. This program not only provided jobs but also fostered a greater appreciation for the outdoors among participants and the public.