Legitimate military target
Protocol I to the Geneva Conventions, Article 52, provides for the general protection of civilian objects, restricting attacks to military objectives. Article 52 states, "In so far as objects are concerned, military objectives are limited to those objects which by their nature, location, purpose or use make an effective contribution to military action and whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, offers a definite military advantage."
Any attack must be justified by military necessity: An attack or action must be intended to help in the military defeat of the enemy, it must be an attack on a military objective, and the harm caused to civilians or civilian property must be proportional and not excessive in relation to the concrete and direct military advantage anticipated.
Legitimate military targets include: armed forces and persons who take part in the fighting; positions or installations occupied by armed forces as well as objectives that are directly contested in battle; military installations such as barracks, war ministries, munitions or fuel dumps, storage yards for vehicles, airfields, rocket launch ramps, and naval bases.