4-74. CS and CSS unit commanders ensure training exercises are designed in such a way as to provide opportunities to train on CS and CSS company and battalion level METL tasks. For example, a corps support group (CSG) commander may design an exercise that provides an opportunity for a subordinate engineer battalion (combat heavy), a quartermaster company (water supply) (direct support/general support [DS/GS]) and a quartermaster tactical water distribution team (Hoseline) to practice selected wartime METL tasks while participating in a support operations training exercise. In this exercise, these units provide water supply and distribution, and restore vital infrastructure to a host country devastated by a natural or man-made disaster. Figure 4-23 highlights a number of supporting tasks, at different echelons, that an engineer battalion (combat heavy) performs during such a support operation exercise. All these tasks support a single wartime METL task of construct/repair water distribution system.