Just did some checking on these three.
Two just returned what i expected but the third one 98-00007 came back with this odd response.
https://farsite.hill.af.mil/reghtml/changes/classdev/98-o0007.htm
Got an odd response when I checked up on 98-00007.
https://farsite.hill.af.mil/reghtml/changes/classdev/98-o0007.htm
Very rare unless they are a formation sharing a callsign.
I got a strange response on that one. Checking the tail number led to a DoD memorandum.
Very weird.
https://farsite.hill.af.mil/reghtml/changes/classdev/98-o0007.htm
Davison AAF Washington DC.