Rank

Ranks are unlocked while progressing through the game (?). Appointing a companion to a specific rank provides some benefits, but costs Influence and increases their Wages. Each troop can have one Captain and multiple Lieutenants.

Captain

Promoting a companion to Captain automatically teaches them the skill [Galvanize] and allows them to be assigned to the [Strategy Table] in [Camp].

Lieutenant

Promoting a companion to Lieutenant automatically teaches them the skill [Tactical Order] and allows them to be assigned to the [Strategy Table] in [Camp].