[DRG]

The branch of the service is really irrelevant for game purposes so they will not be changed as to where they are offered in the game ( as an infantry units Vs Artillery ). They are either "AT" or "ATGM" depending mainly on if they are guided or not and the date they go in and out of service depends on if one day all were removed and replaced by a new type or the new one was phased in gradually.

Don't expect to match game reality and RL reality exactly. You can post your suggestions and I will determine how they will best be integrated into the game ..or not