From the Document: "In June 2021, the Department of Defense submitted to the Congress the Navy's 30-year shipbuilding plan for fiscal year 2022. The Congressional Budget Office is required by law to analyze that plan and assess its costs. The agency's assessment is the subject of this report. In its 2022 plan, the Navy provided less information than it has in most previous plans; CBO's analysis was limited to the information that the Navy provided."
Congressional Budget Office: https://www.cbo.gov/