Rakiel said:
As an aside, when the original Codex: Sisters of Battle was released, normal Battle Sister squads lacked the ability to use Acts of Faith (only Seraphim had that ability by themselves) - they needed a Sister Superior or similar "Faithful" character to use those abilities. The list of "Faithful" characters included the assortment of Preachers, Missionaries and Confessors that were also part of the armylist... so the Acts of Faith that are so frequently seen as a defining feature of the Adepta Sororitas have been available to non-Sororitas characters pretty much since their first appearance.