text: Tactical Control Measures
  Coordinated Fire Line
  A-91. A coordinated fire line is a line
  beyond which conventional surface-to-
  surface direct fire and indirect fire support
  means may fire at any time within the
  boundaries of the establishing
  headquarters without additional
  coordination but does not eliminate the
  responsibility to coordinate the airspace
  required to conduct the mission (JP 3-09).
  The purpose of the CFL is to expedite the
  surface-to-surface attack of targets
  beyond the CFL without coordination
  with the ground commander in whose area
  the targets are located. Such fires still
  comply with rules of engagement and law
  of war targeting constraints; designation
  of a CFL is not authorization to fire
  Figure A-43. Coordinated fire line
  indiscriminately into the area. Brigade
  combat teams or divisions usually
  establish a CFL although a maneuver battalion may establish one, particularly during amphibious operations.
  It is possible for each echelon to establish a CFL so a unit would need to be aware of the several constraints.
  A CFL should be placed on identifiable terrain, however, additional considerations include the limits of
  ground observation, the location of the initial objectives in the offense, and the requirement for maximum
  flexibility in both maneuver and the delivery of supporting fires. Subordinate CFLs may be consolidated by
  higher headquarters. Figure A-43 depicts a CFL.
  Fire Support Coordination Line
  A-92. The 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 operations, 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). FSCLs facilitate the expeditious
  attack of surface targets of opportunity beyond the
  coordinating measure. The FSCL is not a boundary, the
  synchronization of operations on either side of the FSCL is
  the responsibility of the establishing commander, out to the
  limits of the land or amphibious force boundary. FSCLs
  apply to all fires of air-, land-, and sea-based weapon
  systems using any type of ammunition. If possible, the
  FSCL should follow well-defined terrain features to assist
  identification from the air. The joint force land component Figure A-44. Fire support
  commander (JFLCC) and joint force maritime component coordination line
  commander (JFMCC) cannot employ fires long of the
  FSCL without coordination with affected commanders, and the joint force air component commander
  (JFACC) cannot employ fires short of the FSCL without coordination with the JFLCC or JFMCC. Supporting
  elements attacking targets beyond the FSCL must ensure that an attack will not produce adverse effects on,
  or to the rear of, the line. Short of a FSCL, all air-to-ground and surface-to-surface attack operations are
  controlled by the appropriate land or amphibious force commander. Coordination of attacks beyond the FSCL
  is especially critical to commanders of air, land, and special operations forces. Figure A-44 depicts an
  example FSCL.