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Collateral damage is damage to things that are incidental to the intended target. It is frequently used as a military term where it can refer to the accidental or unintentional killing or wounding of non-combatants and/or destruction to non-combatant property during attacks on legitimate enemy targets.
The word "collateral" comes from medieval Latin collateralis, from col-, "together with" + lateralis (from latus, later-, "side" ) and is otherwise mainly used as a synonym for "parallel" or "additional" in certain expressions ("collateral veins" run parallel to each other and "collateral security" means additional security to the main obligation in a contract). The first known usage of the term "collateral damage" in this context occurred in a May 1961 article written by T. C. Schelling entitled "DISPERSAL, DETERRENCE, AND DAMAGE".
The USAF Intelligence Targeting Guide defines the term "[the] unintentional damage or incidental damage affecting facilities, equipment, or personnel, occurring as a result of military actions directed against targeted enemy forces or facilities. Such damage can occur to friendly, neutral, and even enemy forces". Another United States Department of Defense document uses "[u]nintentional or incidental injury or damage to persons or objects that would not be lawful military targets in the circumstances ruling at the time. Such damage is not unlawful so long as it is not excessive in light of the overall military advantage anticipated from the attack."
Intent is the key element in understanding the military definition as it relates to target selection and prosecution. Collateral damage is damage aside from that which was intended. Since the dawn of precision guided munitions, military "targeteers" and operations personnel are often considered to have gone to great lengths to minimize collateral damage.
The term 'collateral damage' has also been borrowed by the computing community to refer to the denial of service to legitimate users when administrators take blanket preventative measures against some individuals who are abusing systems. For example, Realtime Blackhole Lists used to combat email spam generally block ranges of Internet Protocol (IP) addresses rather than individual IPs associated with spam, and can deny legitimate users within those ranges the ability to send email to some domains.
The related term collateral mortality is also becoming prevalent, and probably derives from the term collateral damage. It has been applied to other spheres in addition to the original military context. An example is in fisheries where bycatch of species such as dolphins are called collateral mortality; i.e., they are species that die in pursuit of in the legal death of fishery targets, such as tuna.
The U.S. military states the term is used in regards to unintentional or incidental damage to non-combatant property and non-combatant casualties, however, at least one source claims that the term "collateral damage" originated as a euphemism during the Vietnam War and can refer to friendly fire, or the intentional killing of non-combatants and the destruction of their property.
During World War II, widespread civilian casualties and damage to civilian property were caused by strategic bombing of enemy cities. If the intent of the strategic bombing was to destroy the enemy's war industry, then civilian casualties were called collateral damage. Given the low accuracy of bombing technology in WWII, it was inevitable that civilian casualties would occur. However, bombardments such as the Japanese bombing of Chongqing and the indiscriminate attacks by the Germans on Allied cities with V-weapons fall outside the definition of collateral damage as these raids were meant to terrorize and kill enemy civilians.
Also during the 1991 Gulf War, Coalition forces used the phrase 'collateral damage' to describe the killing of civilians in attacks on legitimate military targets. According to Scottish linguist Deborah Cameron, "the classic Orwellian argument for finding this usage objectionable would be that
In 1999, "collateral damage" (German: Kollateralschaden) was named the German Un-Word of the Year by a jury of linguistic scholars. With this choice, it was criticized that the term had been used by NATO forces to describe civilian casualties during the Kosovo War, which the jury considered to be an inhuman euphemism.
Military necessity, along with distinction, and proportionality, are three important principles of international humanitarian law governing the legal use of force in an armed conflict and how that relates to collateral damage.
Luis Moreno-Ocampo, Chief Prosecutor at the International Criminal Court, investigated allegations of war crimes during the 2003 invasion of Iraq and he published an open letter containing his findings. In a section titled "Allegations concerning War Crimes" elucidates this use of Military necessity, distinction and proportionality:
Under international humanitarian law and the Rome Statute, the death of civilians during an armed conflict, no matter how grave and regrettable, does not in itself constitute a war crime. International humanitarian law and the Rome Statute permit belligerents to carry out proportionate attacks against military objectives, even when it is known that some civilian deaths or injuries will occur. A crime occurs if there is an intentional attack directed against civilians (principle of distinction) (Article 8(2)(b)(i)) or an attack is launched on a military objective in the knowledge that the incidental civilian injuries would be clearly excessive in relation to the anticipated military advantage (principle of proportionality) (Article 8(2)(b)(iv).
Article 8(2)(b)(iv) criminalizes:
Intentionally launching an attack in the knowledge that such attack will cause incidental loss of life or injury to civilians or damage to civilian objects or widespread, long-term and severe damage to the natural environment which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated;
Article 8(2)(b)(iv) draws on the principles in Article 51(5)(b) of the 1977 Additional Protocol I to the 1949 Geneva Conventions, but restricts the criminal prohibition to cases that are "clearly" excessive. The application of Article 8(2)(b)(iv) requires, inter alia, an assessment of:
(a) the anticipated civilian damage or injury;
(b) the anticipated military advantage;
(c) and whether (a) was "clearly excessive" in relation to (b).
The U.S. military follows a technology-based process for estimating and mitigating collateral damage. The software used is known as "FAST-CD" or "Fast Assessment Strike Tool—Collateral Damage."