Perhaps they need to shut down the service altogether and let the parks be monitored by volunteers.
At the very least, they should revert to the States. Why we have national-level parks at all is beyond me.
Why shut down the service?
Have all the park rangers just say, NO. NO, I won’t prevent WWII veterans from visiting the monument built in their honor. And by the way Mr Supervisor, I feel like you’re bullying me and I’m going to file a complaint against you for harassment with HR.
Simple, they’re civil servants, they can’t get fired anyway.