I imagine it to be more adding the lines of "the players are pilots of an Armored unit, composed entirely of Robots and Power Armor." Depending on the origins of the unit, there's a whole host of campaign and session possibilities. Think about it: an Armored Company in RIFTS, non-CS, effectively a mercenary unit. Depending on the leadership, they could go around defending settlements, using their Mecha to help build settlements. So on and so forth.