Commander Brock is located at N-W corner inside Tir city, he's got a ring, and want you to have a similiar. Say that you don't have a ring, and you'll get a mission to Kill Grunts for their tags.
Right... What your supposed to do is to kill Omni NPC's.
The ones that gave me my tags is Amature OT xxx and Fresh OT xxx (where xxx is a profession). Most of these NPC's are located
in greater Tir Country (North of Tir).
At location 2300,1600 in Greater Tir Country you find a
Camp with Fresh OT xxx they drop the tags your after.
around the perimiter is Amature OT xxx they also drop
the tags. When I finally found this spot it took me about 30 min
to get all 10.
This quest took me about 5h to complete, basicly becouse I didn't know what to do. Neutral NPC's never dropped
any tags neither did any of the NPC camps in Varmint Woods.
However they might drop, but I didn't get any.
A litttle south of Tir there are some Amature OT xxx NPC's, they never dropped any tags either. Wich makes me belive they only
drop in Greater Tir Country but this might not be the case.
At location 1200,1400 (in GTC)there is a Neutral Amature xxx Camp. I camped this place for about 1h. never dropped any tags. However
around this camp there are Amature OT xxx NPC's which drop tags.
Rookie OT xxx also drops Rookie tags, these are for the second Brock quest. (So kill all Rookies you find too, will save you some time
hope this helps some....