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Australia
Practice Relating to Rule 15. The Principle of Precautions in Attack
Section C. Feasibility of precautions in attack
Australia’s Defence Force Manual (1994) defines feasible precautions as “precautions which are practicable or practically possible taking into account all circumstances ruling at the time, including humanitarian and military considerations”. 
Australia, Manual on Law of Armed Conflict, Australian Defence Force Publication, Operations Series, ADFP 37 – Interim Edition, 1994, p. xxiv.
Australia’s LOAC Manual (2006) states that “all feasible precautions must be taken to gather relevant intelligence and ensure attacks are directed against military objectives”. 
Australia, The Manual of the Law of Armed Conflict, Australian Defence Doctrine Publication 06.4, Australian Defence Headquarters, 11 May 2006, § 5.1; see also § 2.9.
The manual further states that the duties of Australian Defence Force commanders include “taking all feasible precautions, in the choice of means and methods of attack, to minimise collateral damage”. 
Australia, The Manual of the Law of Armed Conflict, Australian Defence Doctrine Publication 06.4, Australian Defence Headquarters, 11 May 2006, § 5.61.
The manual’s Glossary defines “feasible precautions” as: “Precautions which are practicable or practically possible taking into account all circumstances ruling at the time including humanitarian and military considerations.” 
Australia, The Manual of the Law of Armed Conflict, Australian Defence Doctrine Publication 06.4, Australian Defence Headquarters, 11 May 2006, Glossary.
The LOAC Manual (2006) replaces both the Defence Force Manual (1994) and the Commanders’ Guide (1994).