Related Rule
Australia
Practice Relating to Rule 16. Target Verification
Australia’s Defence Force Manual (1994) states: “Everything feasible [must be done] to verify that objects being attacked are military objectives.” 
Australia, Manual on Law of Armed Conflict, Australian Defence Force Publication, Operations Series, ADFP 37 – Interim Edition, 1994, § 556(d); see also Law of Armed Conflict, Commanders’ Guide, Australian Defence Force Publication, Operations Series, ADFP 37 Supplement 1 – Interim Edition, 7 March 1994, § 957(a).
Australia’s LOAC Manual (2006) states that it is the duty of Australian Defence Force commanders to do “everything feasible to verify that objects being attacked are military objectives”. 
Australia, The Manual of the Law of Armed Conflict, Australian Defence Doctrine Publication 06.4, Australian Defence Headquarters, 11 May 2006, § 5.61; see also § 5.53.
The LOAC Manual (2006) replaces both the Defence Force Manual (1994) and the Commanders’ Guide (1994).