I've seen that TA unit. I was thinking Training Academy. You would have to catch the 3 digit shop # to determine if its the same unit or if there are mulitple units. I'll have to remember to check. I wonder if it could mean Tactical Ambulance.they were using it internally for recording, never intended for us. maybe found a new/better way.
speaking of DEMS what unit is it that has TA on the side where the unit number usually is. not sure if there is one or multiple units like this.