The following are the ONLY people who fall into the category as you described it, everyone else on the list I have seen in game multiple times this month and most multiple times this week:

Sergeant:
Arjuna Pandava

Corporal:
Bit Mouse
Kurio Hogun
Borne OfFire
Anax Ironfaith
Hele moto
Silver Bullet

Private:
Lusid Blindhammer
Rioran Emerlow
Anniethrax Plaguebringer

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