I've seen talker aliases on Ohio MARCS but it was Motorola company ID's and only a few. Happened to see them in the event log on one of the SDR trunking apps. Out of the 1000's of ID's logged it was only like 4 IDs that had it. If you think about it, probably a bell or whistle that nobody bothers with programming because they got way more to do than aliases. Now if it's the alias programmed in the radio that might be another thing. My radios have aliases from the CPS and I've not looked to see if those aliases made it through. Something I'm curious about but not curious enough to mess with it because of the aforementioned amount of other things to do.