I think the most important point to remember is that, though sustainment brigades, most often, will not be assigned to divisions, there will always be a sustainment brigade in support of a division and it's BCTs [brigade combat teams] and any support brigades assigned. The sustainment brigade must be the “single face to the supported unit.” Sustainment brigades will always have assigned areas of operations—specific geographic areas for which they are assigned to provide support through their CSSBs [combat sustainment support battalions] to brigade support battalions (who are supporting their BCTs/brigades) or to directly support non-brigade-aligned units. This is true both ...