From the Executive Summary: "In compliance with the Fiscal Year 2020 National Defense Authorization Act (NDAA), the United States Department of the Navy (Navy) measured sound levels of jet aircraft at Naval Air Station (NAS) Whidbey Island and NAS Lemoore over the past year and compared the resulting measured data with modeled noise data. In accordance with Department of Defense (DoD) policy, the Navy assesses military noise using DoD-approved noise models for impact assessments and long-term land use planning. Measuring of military sound is implemented only when modeling is not feasible. In this case, Congress directed the Navy to measure aircraft sound by conducting real-time sound monitoring and to report the results of such monitoring, along with a comparison of the monitoring results with noise contours from prior studies that used DoD-approved noise modeling."
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