text: FM 7-100.1 ________________________________________________________________________________
  the OSC. He suballocates some assets to the IFC and to other OSC
  subordinates based on support mission requirements. The remainder he
  places under the ISC commander. Figure 12-3 shows a typical OSC
  organization, with an example of the types of combat service support and
  combat support units that might appear in an OSC ISC.
  OSC
  TACTICAL-
  IFC ISC LEVEL
  SUBORDINATES
  ISC
  ISG
  HEADQUARTERS
  MATERIEL HEAVY
  SUPPORT EQUIPMENT MAINTENANCE
  TRANSPORT BATTALION
  BRIGADE
  BRIGADE
  CHEMICAL TRAFFIC
  SMOKE
  DEFENSE CONTROL
  BATTALION
  BATTALION BRIGADE
  INFORMATION PERSONNEL
  MEDICAL
  WARFARE SUPPORT
  BATTALION
  BRIGADE BATTALION
  Figure 12-3. Task Organization, with ISC Example
  12-41. The number and type of units in the ISC and ISG will vary according
  to the number and size of supported units in the OSC and its IFC,
  respectively. For example, an ISC supporting an OSC composed mainly of
  tank and mechanized infantry units will differ from an ISC supporting an
  OSC composed mainly of infantry or motorized infantry units. When the
  logistics units are no longer required for ISC or ISG functions, the primary or
  area support units will revert to control of their original parent units in the
  administrative force structure or otherwise will be assigned to other
  operational-level commands, as appropriate.