text: Appendix B
  B-3. A dashed black line, with "CFL" followed by the establishing HQ above the line and the effective date-
  time group below the line provides graphic portrayal of the CFL (see figure B-1). Locations for CFLs are
  disseminated by message or overlay through maneuver and FS channels to higher, lower, adjacent maneuver,
  and supporting units.
  Figure B-1. Coordinated fire line example
  FIRE SUPPORT COORDINATION LINE
  B-4. A fire support coordination line is a fire support coordination measure established by the land or
  amphibious force commander to support common objectives within an area of operation, beyond which all
  fires must be coordinated with affected commanders prior to engagement and, short of the line, all fires must
  be coordinated with the establishing commander prior to engagement (JP 3-09). The optimum placement of
  the FSCL varies with specific AO circumstances, but considerations include the ground force positions and
  anticipated scheme of maneuver during the effective time period of the FSCL and their indirect FS systems’
  range limits, where typically the preponderance of lethal effects on the AO shifts from the ground component
  to the air component. For more information see JP 3-09.