Photos show how FDR’s ‘tree army’ helped shape America’s national parks — and how the NPS has changed since – Business Insider Posted on August 26, 2026 By Malcolm Knoll No Comments on Photos show how FDR’s ‘tree army’ helped shape America’s national parks — and how the NPS has changed since – Business Insider Photos show how FDR’s ‘tree army’ helped shape America’s national parks — and how the NPS has changed since Business Insider Photos show how FDR’s ‘tree army’ helped shape America’s national parks — and how the NPS has changed since Business