FM 3-09 governs fire support and field artillery operations, planning, coordination, execution, and assessment in multidomain operations.
View FM 3-09 on armypubs.army.mil
FM 3-09 covers the fire support system, field artillery operations, competition and crisis, and large-scale combat operations. It establishes principles for planning, coordination, execution, and assessment, and requires compliance with applicable laws, regulations, treaties, and rules of engagement.
Applies to: FM 3-09 applies to the Regular Army, the Army National Guard/Army National Guard of the United States, and the United States Army Reserve unless otherwise stated.
Enemy A2 refers to those actions and capabilities, usually long-range, designed to prevent an opposing force from entering an operational area (OA). (paragraph 1-5)
AD refers to those actions and capabilities, usually of shorter range, designed not to keep an opposing force out, but to limit its freedom of action within the OA. (paragraph 1-5)
FA attack/delivery systems provide continuously available fires under all weather conditions, and in all but the most restrictive terrain. (paragraph 2-80)
MLRS/HIMARS is used for counterfire and deliberate attacks against enemy air defense, light materiel, and personnel targets. (paragraph 2-81)
Observed fire is the point of projectile impact or burst that can be seen by an observer, and can be adjusted on the basis of observation. (paragraph 4-89)