Friday marks the first missed paycheck for federal workers, but who else will be impacted as the shutdown grinds on?

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The image features a large sign with the words "Denver Federal Center" written on it. The sign is located in front of a building, and there are trees in the background. The scene is set on a street, and there are cars parked nearby.
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FILE - The main entrance to the Denver Federal Center in Lakewood, Colo.

DIA AIRPORT SECURITY TSA PRE CHECK
Hart Van Denburg/CPR News
Passengers wait in line at the TSA Pre Check line last Denver International Airport, Nov. 1, 2023.

210721-ROCKY-MOUNTAIN-NATIONAL-PARK-RMNP-ENTRY-PERMIT
Hart Van Denburg/CPR News
Visitors line up at Rocky Mountain National Park’s Fall River Entrance Station, near Estes Park, on July 21, 2021. The park has instituted a timed entry permit and an entrance pass program from May 28 through October 11 this year, as a way of managing increased visitor demand alongside COVID-19 concerns, budget constraints and staffing challenges.