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Does anyone even do this? How do you keep things straight if more than one unit of Purifiers or Strikers is involved in an assault?

I mark the rims of my bases a different colour for each unit, at the back of course.

Colours for the heraldry of each marine works.

So one squad may have red/black, one red/white, one black/white, one black, white and red.

Each marine in the squad gets their own specific pattern.

If you really want a lot of variants you can use a division of the heraldy to display that of the squad leader.

Heraldry what now? On power armor GK? Where can that fit?

Usually on those little heraldic shields for Terminators, and maybe shoulder pads and/or greaves for Power Armor Marines?