text: FM 7-100.1________________________________________________________________________________
  • Due to modifications to the SCP, a standing operational-level head-
  quarters that was originally designated as an OSC headquarters may
  receive one or more additional major operational-level commands from
  the administrative force structure as fighting commands. Then the
  OSC headquarters would transition into an FG headquarters.
  In the first two cases, a separate FG staff would be formed and identified as
  having control over two or more OSCs (or operational-level commands from
  the administrative force structure) as part of the same SCP. In the third case,
  the original OSC headquarters would be redesignated as an FG headquar-
  ters. In any case, the FG command group and staff would be structured in
  the same manner as those of an OSC.
  “THE STATE”
  Field
  Field
  Group
  Group
  Sea
  XXXX
  XXX XXXX XXXX XXXX
  Neutral XXXX XXX XXX XXXX XXX
  Country
  Hostile Country Sea
  Figure 2-5. Field Groups Consisting of Multiple Operational-Level Commands from
  the Administrative Force Structure
  Operational-Strategic Command
  2-36. The OPFOR’s primary operational organization is the OSC. Once the
  General Staff writes a particular SCP, it forms one or more standing OSC
  headquarters. Each OSC headquarters is capable of controlling whatever
  combined arms, joint, interagency, or multinational operations are necessary
  to execute that OSC’s part of the SCP. However, the OSC headquarters does
  not have any forces permanently assigned to it.