Definition/Scope: (FM 3-0) To use, or threaten to use, lethal force to establish control and dominance, effect behavioral change, or enforce compliance with mandates, agreements, or civil authority. The appropriate and discriminate use of lethal force reinforces efforts to stabilize a situation, gain consent, or assure compliance. Conversely, misusing force can adversely affect an operation's legitimacy. Legitimacy is essential to producing effective compliance. Compliance depends on how the local populace and others perceive the force's ability to exercise lethal force to accomplish the mission.