origin-www.disa.mil has no NS records.
NS records for this zone are defined at disa.mil.
NS records for this zone are defined at disa.mil.
Question and response
Question
dig origin-www.disa.mil. NS
Answer
The response has no answer records.
Authority
disa.mil. 686 SOA dns1.disa.mil. disa\.tinker\.ie\.list\.dci-ii-dns.mail.mil. 2027517097 10800 1080 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0