Apex domains cannot have CNAME records.
Question and response
Question
dig army. NS
Answer
army. 5 NS v0n1.nic.army.
army. 5 NS v0n3.nic.army.
army. 5 NS v2n1.nic.army.
army. 5 NS v2n0.nic.army.
army. 5 NS v0n2.nic.army.
army. 5 NS v0n0.nic.army.
Authority
The response has no authority records.
Additional
v0n0.nic.army. 60918 A 65.22.28.59
v0n1.nic.army. 45899 A 65.22.29.59
v0n2.nic.army. 13132 A 65.22.30.59
v0n3.nic.army. 45899 A 161.232.14.59
v2n0.nic.army. 10010 A 65.22.31.59
v2n1.nic.army. 10010 A 161.232.15.59
v0n0.nic.army. 60918 AAAA 2a01:8840:1e:0:0:0:0:59
v0n1.nic.army. 45899 AAAA 2a01:8840:1f:0:0:0:0:59
v0n2.nic.army. 13132 AAAA 2a01:8840:20:0:0:0:0:59
v0n3.nic.army. 45899 AAAA 2a01:8840:f8:0:0:0:0:59
v2n0.nic.army. 10010 AAAA 2a01:8840:21:0:0:0:0:59
v2n1.nic.army. 10010 AAAA 2a01:8840:f9:0:0:0:0:59
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0