Broadly speaking, for company organisation:
Tactical Squads are now Battleline Units, and can be Tactical, Intercessor, Heavy Intercessor or Infiltrator Squads
Assault Squads are now Close Support Units, and can be Assault, Assault Intercessor, Reiver, Incursor or Inceptor Squads
Devastator Squads are now Fire Support Units, and can be Aggressor, Devastator, Eliminator, Hellblaster, Suppressor or Eradicator Squads.
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