ns.usda.gov has no CNAME records.
Question and response
Question
dig ns.usda.gov. NS
Answer
The response has no answer records.
Authority
usda.gov. 900 SOA ns1.usda.gov. duty\.officer.usda.gov. 2025509926 90000 9000 90000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0