The U.S. National Parks Service operates fixed wing aircraft across the U.S, with significant presences in places like Alaska and the Western U.S, to perform a number of missions including resource management, backcountry patrol, cargo and personel transport, as well as supporting local SAR, Firefighting, and law enforcement efforts. They operate a diverse fleet of rented and owned aircraft, largely consisting of smaller GA aircraft and helicopters. This particular livery is based on a seaplane refurbished by the Park Service in 2017 in Nevada. I found a couple of pictures of what appears to be a land-based Cessna painted in a similar scheme, but in general the NPS fleet is quite diverse. 

This file is now updated to include G1000 and Classic versions of the livery. The main file contains both, or you can install separately.

To install, extract the zip folder to your MSFS Community Folder.