What two concepts must be applied to determine the appropriate level of force when using military action?

The correct answer is anchored in the principles of necessity and proportionality, which are foundational to the lawful and ethical application of military force. Necessity dictates that the use of force must be essential to achieve a specific military objective. This means that military action should only be initiated when there are no viable alternatives available that would achieve the same objective without resorting to force. Proportionality complements this concept by ensuring that the level of force used is commensurate with the threat faced or the objective sought. This principle seeks to prevent excessive or unnecessary harm that could result from military action, ensuring that the response is balanced against the military advantage anticipated.

In military operations, these principles work together to guide commanders in making informed decisions. The goal is to achieve military objectives while minimizing collateral damage and maintaining adherence to international laws of armed conflict. Understanding and applying these concepts is crucial for ensuring that military actions are justifiable and responsible, thereby upholding moral and legal standards in warfare.