القاعدة ذات الصلة
Canada
Practice Relating to Rule 21. Target Selection
Canada’s LOAC Manual (1999) states:
The proportionality test must be used in the selection of any target. Proportionality and multiple targets: Where a choice is possible between several legitimate targets for obtaining a similar military advantage, the target to be selected shall be the one on which an attack would be expected to cause the least civilian casualties and damage to civilian objects. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-3, §§ 18 and 19; see also p. 7-5, § 49 (air to land operations).
Canada’s LOAC Manual (2001) states in its chapter on targeting:
414. Proportionality and multiple targets
1. Where a choice is possible between several legitimate targets for obtaining a similar military advantage, the target to be selected shall be the one on which an attack would be expected to cause the least civilian casualties and damage to civilian objects. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 414.1.
In its chapter on air warfare, the manual states:
When a choice is possible between several legitimate targets for obtaining a similar military advantage, the target to be selected shall be the one where the attack may be expected to cause the least danger to civilian lives and to civilian objects. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 716.5.