text: Chapter 2
  with the J-2 and J-2T for target development. The FAIO is also responsible for the integration of FA C2
  systems into the mission command networks in coordination with the FFA HQ S-6 and brigade, division or
  corps G-6. For more information on the FAIO see FM 3-60.
  BRIGADE FIRE SUPPORT OFFICER
  2-15. A fire support officer is the operational to tactical level field artillery officer responsible for
  advising the supported commander or assisting the fire support coordinator on fires functions and fire
  support. The brigade fire support officer (FSO) is the senior FA staff officer responsible for planning,
  preparing, and executing all aspects of FS for BCT operations. More than any other officer, the FSO must
  understand the FSCOORD's intent in supporting the operation and understands all of the duties of the
  FSCOORD listed in paragraph 2-6. For information on the BCT FSO duties see ATP 3-09.42.
  BATTALION FIRE SUPPORT OFFICER
  2-16. The BN FSO is the senior FA staff officer at the supported BN or aviation BN. The BN FSO advises
  the respective BN commander on fire support planning and employment considerations. The BN FSO plans,
  prepares, executes, and provides assessment of all aspects of fire support for BN operations and provides
  bottom-up refinement of the fire support plan. For more information on the BN FSO duties see ATP 3-09.42.
  COMPANY FIRE SUPPORT OFFICER
  2-17. The company/troop FSO works for the company/troop commander during combat operations to
  accomplish all EFSTs. The FSO is assigned to the FA BN and under the functional supervision of the BN
  FSO. The FSO devises the FS plan based on the commander's guidance and submits the plan to the
  commander for approval. The FSO plans, prepares, executes, and provides assessment of all aspects of FS
  for company operations and provides bottom-up refinement of the FS plan. For more information on the
  company FSO duties see ATP 3-09.42.
  FIRE SUPPORT SERGEANT
  2-18. The company FS sergeant or FS non-commissioned officer is the senior enlisted assistant to the
  company FSO. The fire support sergeant performs the duties of the FSO in their absence. The fire support
  sergeant advises the FSO on the allocation and tasking of joint fires observers, other observers, and trains the
  fire support team (FIST) and the forward observer (FO) in applicable FS tactics and techniques. A fire support
  team is a field artillery team provided for each maneuver company/troop and selected units to plan and
  coordinate all supporting fires available to the unit, including mortars, field artillery, naval surface fire
  support, and close air support integration (JP 3-09.3). For more information on the FIST and FS sergeant's
  duties see ATP 3-09.42.
  FORWARD OBSERVER
  2-19. The FO is the fire support representative for the maneuver platoon. The FO's primary duty is to
  accurately locate targets, then call for, and adjust FS. The forward observer is an individual operating with
  front line troops and trained to adjust ground or naval gunfire and pass back battlefield information (JP 3-
  09). The FO must fully understand their responsibility within the observation plan and provide refinement or
  submit key targets for inclusion in the company fire plan. A fire plan is a tactical plan for using the weapons
  of a unit or formation so that their fire will be coordinated. For more information on FO duties see ATP
  3-09.30.
  JOINT FIRES OBSERVER
  2-20. A joint fires observer is a certified and qualified Service member who requests, controls, and adjusts
  surface-to-surface fires; provides targeting information in support of close air support; and performs terminal
  guidance operations (JP 3-09.3). A joint fires observer cannot perform terminal attack control of CAS
  missions and does not replace a qualified joint terminal attack controller (JTAC) or forward air controller
  (airborne) (FAC(A)). Terminal guidance operations are actions that provide electronic, mechanical, voice or