In 2015 Scouts performed 56,978 service hours of activities in National Park sites.  That is a lot of service hours and that is just the hours that were actually reported.  This is real savings to the National Park service.  Using minimum wage of $7.25 that a savings of $413,090.50 for just 2015 alone.  Since the scouts and the National Park Service have a very long history together over time this number is much higher.