text: Appendix B
  SUPPORT BY FIRE
  B-58. Support by fire is a tactical mission task in which a unit
  engages the enemy by direct fire in support of another
  maneuvering force. The primary objective of the support force is
  normally to fix and suppress enemy forces so that they cannot
  effectively fire on the maneuvering force. The secondary objective is
  to destroy enemy forces if they try to reposition. The commander
  specifies the desired effect on enemy forces when assigning this task.
  The support by fire tasked is rarely applicable to units larger than
  company size. Figure B-27 depicts the support by fire tactical mission
  task. Figure B-27. Support by fire
  task
  B-59. A unit conducting the task of support by fire does not maneuver
  to capture enemy forces or terrain. A commander gives this task to another unit as part of a larger maneuver.
  When assigning a support by fire mission, a commander designates the enemy force, when to attack, the
  general location from which to operate, the friendly force to support, and the purpose of the task, such as fix
  or suppress. The ends of the arrows point in the general direction of the targeted unit or location. The base of
  the area indicates the general area from which to deliver fires.
  B-60. Once a commander gives an element the task of support by fire, it should occupy support by fire
  positions that have cover and concealment, good observation, and clear fields of fire. Elements occupying
  support by fire positions should—
  * Check the security of the position.
  * Search for targets.
  * Orient weapons on likely or suspected enemy positions.
  * Occupy fighting positions providing some degree of protection. Armored and Stryker forces
  occupy hull-down firing positions, while infantry forces use trees, natural berms, and similar
  existing terrain features.
  * Assign observation sectors to each Soldier or weapon system in the support by fire element.
  * Use available thermal sights to locate heat sources not visible to the naked eye, such as vehicles
  concealed in tree lines or other wooded areas or personnel serving at observation posts.
  B-61. Support by fire closely resembles the task of attack by fire. The difference is that support by fire
  supports another force so that it can maneuver against enemy forces, while an attack by fire does not support
  the maneuver of another friendly force.
  SUPPRESS
  B-62. Suppress is a tactical mission task in which a unit temporarily
  degrades a force or weapon system from accomplishing its mission.
  It occurs when a unit employs direct or indirect lethal and nonlethal
  effects, such as artillery, electromagnetic warfare, or smoke on enemy
  personnel, weapons, and equipment to prevent or degrade enemy fires,
  sensors, and visual observation of friendly forces. Unlike the
  neutralization task, the original target regains its effectiveness without
  needing to reconstitute once the effects of the systems involved in the
  suppression effort lift or shift to another target. Figure B-28 depicts the
  suppress tactical mission task. Figure B-28. Suppress task