Règle correspondante
Colombia
Practice Relating to Rule 17. Choice of Means and Methods of Warfare
Colombia’s Operational Law Manual (2009) states:
3. Fundamental guarantees and IHL principles
These guarantees have been embodied in principles that guide behaviour during situations of hostilities and must be observed throughout all military operations:
- Principle of precautions in attack: … [T]he Constitutional Court has held that “among the main expressions of the principle of precaution are: … (ii) the obligation of the parties to the conflict to take all feasible precautions in the choice of the means and methods of warfare to be used in order to avoid or minimize incidental loss of life and injuries among the civilian population and damage to civilian objects and to protect civilians from the effects of attacks[”.] 
Colombia, Manual de Derecho Operacional Manual FF.MM. 3-41 Público, Primera Edición 2009, Comando General de las Fuerzas Militares, aprobado por el Comandante General de las Fuerzas Armadas por Disposición Número 056, 7 December 2009, pp. 36–39.
[footnote in original omitted]
The manual further states:
The weapons, ammunition and explosives used by the Armed Forces must be previously authorized by law or regulation. The above is without prejudice to the fact that, even if there are some weapons that are permitted, they must be employed in accordance with the principles of humanity, necessity, distinction, proportionality, non-reciprocity and precautions in attack. 
Colombia, Manual de Derecho Operacional Manual FF.MM. 3-41 Público, Primera Edición 2009, Comando General de las Fuerzas Militares, aprobado por el Comandante General de las Fuerzas Armadas por Disposición Número 056, 7 December 2009, p. 56.
The manual also states:
3. Minimum contents of operational orders
c. Execution
The description of the execution of the operation must include the Commander’s operational concept. Within these sections, the following contents, depending on the operation[,] … should be included:
(i) For operations in a hostilities scenario:
If the operation is carried out in a situation of hostilities, i.e. if the planning can be done within the IHL framework, the section on execution must also include:
- Limitation of means and methods: Assess whether the means (weapons) and methods (tactics) chosen are lawful and pose the least danger to civilians and civilian objects and minimize casualties and damage.
4. Rules of engagement
c. Definitions
(i) Definitions for rules of engagement for land combat …
- Minimize damage: Only the necessary means and methods may be employed. 
Colombia, Manual de Derecho Operacional Manual FF.MM. 3-41 Público, Primera Edición 2009, Comando General de las Fuerzas Militares, aprobado por el Comandante General de las Fuerzas Armadas por Disposición Número 056, 7 December 2009, pp. 100–101, 103 and 107–108.
The manual further states:
If the operation is carried out to counteract a situation of hostilities, meaning that the planning can be done under the legal framework of IHL, the OLA [Operational Legal Adviser] must advise the Commander in describing the:
- The principle of limitation of means and methods: assess whether the means (weapons) and methods (tactics) chosen are lawful and pose the least danger to civilians and civilian objects and minimize casualties and damage[.] 
Colombia, Manual de Derecho Operacional Manual FF.MM. 3-41 Público, Primera Edición 2009, Comando General de las Fuerzas Militares, aprobado por el Comandante General de las Fuerzas Armadas por Disposición Número 056, 7 December 2009, p. 145.
In 2007, in the Constitutional Case No. C-291/07, the Plenary Chamber of Colombia’s Constitutional Court stated:
The precautionary principle is the cornerstone of a number of specific rules which are all considered to have attained customary status and to be applicable in internal armed conflicts … Among these rules is … the obligation of the parties to a conflict to take all feasible precautions in the choice of means and methods of warfare with a view to avoiding, and in any event to minimizing, incidental loss of civilian life, injury to civilians and damage to civilian objects. 
Colombia, Constitutional Court, Constitutional Case No. C-291/07, Judgment of 25 April 2007, p. 99.
[footnote in original omitted]