A terse email that went out to 1,000 National Park Service employees and other Interior Department staff who were fired this week was abrupt and claimed they were being fired for cause.

One-thousand National Park Service staff were being fired Friday as part of the Trump administration's move to reduce the size of federal government, though the agency was told it could begin hiring 5,000 seasonal workers, according to the National Parks Conservation Association.

Trump administration guidelines aimed at dramatically shrinking the size of federal government could diminish services across the National Park System "like no other time since WWII," according to a National Park Service veteran who spent decades with the agency.

While the National Park Service, and other federal agencies, are in a state of turmoil under the administration's push to drastically shrink the size of government, the agency has no idea how many vacant superintendent positions exist across the National Park System.